Visible Range Of Spectrum Research Articles

1D, 2D, and 3D Coordination Polymers based on 2,3‐Pyrazinedithiolate and d10 Metal Ions (Ag+, Zn2+)

AbstractDithiolene based coordination polymers, due to their coordinative bonds with covalent character, feature interesting electrical properties. We present the syntheses and crystal structures of three coordination polymers based on the ligand 2,3‐pyrazinedithiolate (pdt2−) and Ag+ and Zn2+ ions. 2D[Ag3(Hpdt)2](ClO4) (1) and Cs1D[Ag(pdt)] ⋅ CH3OH (2) feature short Ag⋅⋅⋅Ag distances, 3D[Zn(pdt)] (3) has a 3D network structure and is stable up to 480 °C. The optical band gaps of the three coordination polymers are within the visible range of the electromagnetic spectrum. The coordination polymer 1 has the smallest bandgap of 1.8 eV, 2 and 3, with the fully deprotonated ligand, exhibit wider bandgaps of 2.5 and 2.7 eV, respectively.

Dynamic reflective color pixels based on molybdenum oxide.

Active materials which show phase transitions, usually known as Phase Change Materials (PCM), have paved the way to a new generation of reconfigurable plasmonic platforms. Tunable color devices have experienced a great development in the recent years. In particular, reflective color filters can take advantage from sunlight to select and reflect a specific resonant wavelength in the visible spectrum range. Reflective displays are usually structural color filters based on asymmetric Fabry-Perot cavities (AFPCs). For a fixed geometry, most of AFPCs filters generate static color, limiting their potential as tunable color devices. Dynamic color is achieved by introducing an active layer whose optical properties can be modulated by an external stimuli. In this paper, we propose AFPCs based on molybdenum oxide (MoOx, 2<x<3) to achieve switchable on/off color reflective pixels. On and off states of the pixels are controlled through the stoichiometry of the MoOx layer.

An Environmental Perception Self‐Adaptive Discolorable Hydrogel Film toward Sensing and Display

AbstractVision perception, especially color change, is the most direct and convenient way of feedback among numerous information recognition modes. Because of unique discoloration property upon stimulation, photonic crystals have attracted wide attention. Herein, with a facile UV polymerization process under the magnetic field, a sensitive photonic hydrogel film with vivid structural color is made. The structural color comes from the 1D chain‐like structures assembled by the carbon‐encapsulated Fe3O4 colloidal nanocrystal clusters (Fe3O4@CNCs), which are embedded in the flexible hydrogel matrix. The hydrogel can adapt its size to the environment, resulting in the regulation of intergranular distance and apparent color variation. Thus, a hydrogel film with humidity, ion concentration, and stress responsivity can be obtained, showing high sensitivity, stability, and full reversibility in a wide range of visible spectrum. It can be designed as a reusable display board or applied to colorimetric measurements similar to pH test paper. Innovatively, the hydrogel film is integrated as back reflectors to improve the efficiency of semitransparent polymer solar cells while protecting devices. This structural color hydrogel film makes it easier to recognize environmental dynamic changes and provide a wider application prospect in optics devices, sensing, display, and diagnostics.

Cobalt Effect on the Growth of Cadmium Oxide Nanostructure Prepared by Spray Pyrolysis Technique

Spray pyrolysis technique (SPT) is employed to synthesize cadmium oxide nanostructure with 3% and 5% Cobalt concentrations. Films are deposited on a glass substrate at 350 ᵒC with 150 nm thickness. The XRD analysis revealed a polycrystalline nature with cubic structure and (111) preferred orientation. Structural parameters represent lattice spacing, crystallite size, lattice parameter and dislocation density. Homogeneous surfaces and regular distribution of atoms were showed by atomic force microscope (AFM) with 1.03 nm average roughness and 1.22 nm root mean square roughness. Optical properties illustrated a high transmittance more than 85% in the range of visible spectrum and decreased with Co concentration increasing. The absorption coefficient values decreased with increasing wavelength and the prepared films had absorption coefficient values greater than 104 cm-1. The optical energy gap values for allowing direct transition (ADT) varied from 2.78 to 2.63 eV with increasing Co concentration, while the energy gap for allowing indirect transition (AIDT) varied from 1.85 to 1.6 eV with Co concentration.

Metal Oxide Nanoheterostructures for Gas Sensing

1. Introduction.Metal oxides such as SnO2, MoO3. TiO2, CuO, are well-known to exhibit significant changes in their electrical resistance upon admission of certain oxidizing or reducing chemical species which constitutes the base for their application as gas sensors. These materials can be synthesized in different forms ranging from bulk ceramics to thin films. Thin-film technology has contributed significantly to the development of reliable chemical sensors as it is easily controllable and results in reproducible parameters of deposited layers [1,2]. Moreover, it is compatible with interdigitated transducer IDT electrodes which facilitates film deposition and subsequent electrical contacts with the resistance measuring units [3]. Emerging nanotechnology has led to a revolution in sensing especially as far as different forms of nanomaterials have demonstrated better response, sensitivity and selectivity to different stimuli. Moreover, the nanostructured sensors can operate much faster due to better kinetics of responses at relatively low temperatures, i.e., close to room temperature. The aim of this contribution is to review the most recent work performed in the field of thin film resistive-type gas sensors with a special emphasis on the n-n and n- p nanostructures.2. ExperimentalThin films of different stoichiometry and crystal structures have been deposited by magnetron sputtering of Ti, Sn, and Cu targets in reactive Ar+O2 atmosphere with controlled composition. Characterization of films has been performed by X-ray diffraction XRD, X-ray reflectivity, XRR, X-ray photoelectron spectroscopy XPS, atomic force microscopy, AFM, scanning electron microscopy, SEM and optical spectrophotometry over uv and visible range of the light spectrum. Gas sensing measurements both in dc and ac modes have been carried out in a custom-made set-up capable of detecting changes in the electrical resistance under stabilized temperature and humidity level. Modular XM-MTS unit from Solartron Analytical has been used to detect the impedance spectra in reference atmosphere (air) and upon gas (NO2, H2) admission.3. ResultsExperimental results concerning thin film characterization will be presented and compared with the most representative data obtained by other authors. Fundamental properties of different n-type (TiO2, SnO2) and p-type (CuO) semiconductors will be discussed.Depending on the material being sputtered and the substrate on which a thin film is deposited one can observe a growth of different nanostructures. Typically, a columnar structure is obtained in the case of TiO2 while the amorphous films of SnO2 result in a smooth top SEM image composed of small, isolated grains. CuO thin films crystallize easily with relatively large, well-developed grains.Gas sensor responses are good and reproducible in the case of n-type semiconductors such as TiO2 and SnO2. CuO being a p-type semiconductor demonstrates much lower response which can be improved by forming TiO2/CuO n-p type hetero-structure.

Full color fluorescent carbon quantum dots synthesized from triammonium citrate for cell imaging and white LEDs

Multicolor fluorescent carbon quantum dots (CDs) exhibit prospective applications but the intrinsic reaction and luminescence mechanisms of CDs remain unclear. In this work, full color fluorescent CDs were synthesized through a facile solvothermal treatment with triammonium citrate as the carbon source. By adjusting the reaction temperature, the maximum emission wavelength is tuned from 440 nm for blue CDs (B-CDs) to 625 nm for red CDs (R-CDs), covering the whole visible spectrum range. The emission mechanism is proposed as surface-state-controlled, which results from different degrees of graphitization and increasing of functional groups on the surfaces. Three different surface states are derived from the overlap of the absorption and excitation spectra and the mechanism is established by XRD, Raman, XPS and UV–Vis absorption. The full-color luminescent CDs with high light and pH stability as well as good biocompatibility are successfully employed to image HeLa cells. White LED is fabricated by B-, G-, and R-CDs/polymer films with a near ultraviolet (NUV) semiconductor chip. The results of this research demonstrate that the synthesized CDs can be potentially applied in multi-color displays, white LEDs and biological imaging probes.

Photophysical study and in vitro approach against Leishmania panamensis of dicloro-5,10,15,20-tetrakis(4-bromophenyl)porphyrinato Sn(IV)

Background: Photodynamic therapy activity against different biological systems has been reported for porphyrins. Porphyrin modifications through peripheral groups and/or by metal insertion inside the ring are main alternatives for the improvement of its photo-physical properties. In this study, we synthesized and characterized 5,10,15,20-tetrakis(4-bromophenyl)porphyrin and the dicloro-5,10,15,20-tetrakis(4-bromophenyl)porphyrinato Sn(IV). Methods: Metal-free porphyrin was synthesized using the Alder method, while the Sn(IV)-porphyrin complex was prepared by combining metal-free porphyrin with stannous chloride in DMF; the reaction yields were 47% and 64% respectively. Metal-free porphyrin was characterized by UV-Vis, FT-IR, ESI-mass spectrometry and 13C-NMR. Additionally, the Sn(IV) -porphyrin complex was characterized using UV-Vis and FT-IR. Cyclic voltammetry tests in four different solvents. The fluorescence quantum yield (Φ f) was measured using fluorescein as a standard, the singlet oxygen quantum yield (Φ D) was estimated using the standard 5,10,15,20-(tetraphenyl)porphyrin (H2TPP) and the quencher of singlet oxygen 1,3-diphenylisobenzofuran (DPBF). Results: UV-Vis assay showed typical Q and Soret bands for porphyrin and its metallo-porphyrin complex. Compounds showed photoluminescence at the visible range of electromagnetic spectrum. The inclusion of the metal in the porphyrin core changed the Φ f from 0.15 to 0.05 and the Φ D increased from 0.55 to 0.59. Finally, the effect of the compounds on the viability of L. panamensis was evaluated by means of the MTT test. The results showed that both compounds decreased the viability of the parasite; this inhibitory activity was greater under light irradiation; the porphyrin compound had IC 50 of 16.5 μM and the Sn(IV)-porphyrin complex had IC 50 of 19.2 μM. Conclusion: The compounds were synthesized efficiently, their characterization was carried out by different spectroscopy techniques and their own signals were evidenced for both structures, both compounds decreased the cell viability of L. panamensis.

Zn(II)-tetracarboxy-phthalocyanine-Sensitized TiO2 Thin Films as Antimicrobial Agents under Visible Irradiation: a Combined DFT and Experimental Study.

In this article, we studied the antimicrobial activity of TiO2 sensitized by the Zn(II)-tetracarboxy-phthalocyanine (TcPcZn) complex using TiO2-Degussa P25 as a semiconductor source. The TiO2 thin films were deposited by the doctor blade method and were sensitized by the chemisorption process. The obtained compounds were characterized using Fourier transform infrared spectroscopy, UV–vis spectrophotometry, Raman spectroscopy, diffuse reflectance spectroscopy, and scanning electron microscopy. Furthermore, we studied the stability of the adsorbed sensitizer on the semiconductor surface by using the density functional theory (DFT). Additionally, we determined the antimicrobial activity of TcPcZn–TiO2 against methicillin-resistant Staphylococcus aureus (MRSA). The Raman and optical results confirmed the sensitizing process. The TcPcZn–TiO2 thin films showed radiation absorption in the visible range of the electromagnetic spectrum (600–750 nm), and the dye anchored on the TiO2 surface had a band gap of 1.58 eV. The DFT study showed that TcPcZn supported on any phase of Degussa P25 is stable, making them suitable to act as catalysts in the proposed reactions. Finally, the TcPcZn–TiO2 thin films reached 76.5% of inhibition activity against MRSA.

Photophysical study and in vitro approach against Leishmania panamensis of dicloro-5,10,15,20-tetrakis(4-bromophenyl)porphyrinato Sn(IV).

Background: Photodynamic therapy activity against different biological systems has been reported for porphyrins. Porphyrin modifications through peripheral groups and/or by metal insertion inside the ring are main alternatives for the improvement of its photo-physical properties. In this study, we synthesized and characterized 5,10,15,20-tetrakis(4-bromophenyl)porphyrin and the dicloro-5,10,15,20-tetrakis(4-bromophenyl)porphyrinato Sn(IV). Methods: Metal-free porphyrin was synthesized using the Alder method, while the Sn(IV)-porphyrin complex was prepared by combining metal-free porphyrin with stannous chloride in DMF; the reaction yields were 47% and 64% respectively. Metal-free porphyrin was characterized by UV-Vis, FT-IR, ESI-mass spectrometry and 13C-NMR. Additionally, the Sn(IV) -porphyrin complex was characterized using UV-Vis and FT-IR. Cyclic voltammetry tests in four different solvents. The fluorescence quantum yield (Φ f) was measured using fluorescein as a standard, the singlet oxygen quantum yield (Φ D) was estimated using the standard 5,10,15,20-(tetraphenyl)porphyrin (H2TPP) and the quencher of singlet oxygen 1,3-diphenylisobenzofuran (DPBF). Results: UV-Vis assay showed typical Q and Soret bands for porphyrin and its metallo-porphyrin complex. Compounds showed photoluminescence at the visible range of electromagnetic spectrum. The inclusion of the metal in the porphyrin core changed the Φ f from 0.15 to 0.05 and the Φ D increased from 0.55 to 0.59. Finally, the effect of the compounds on the viability of L. panamensis was evaluated by means of the MTT test. The results showed that both compounds decreased the viability of the parasite; this inhibitory activity was greater under light irradiation; the porphyrin compound had IC 50 of 16.5 μM and the Sn(IV)-porphyrin complex had IC 50 of 19.2 μM. Conclusion: The compounds were synthesized efficiently, their characterization was carried out by different spectroscopy techniques and their own signals were evidenced for both structures, both compounds decreased the cell viability of L. panamensis.

Nanostructured FeS2 films: Influence of effective parameters on electrochemical deposition and characterization of physical properties

In this study, films of iron disulfide (FeS2) nanostructures are prepared by electrochemical deposition on the Fluorine-doped tin oxide (FTO) glass substrate. The effect of deposition parameters such as voltage, time, molarity, and also sulfurization temperature are studied as parameters affecting the physical properties of the deposited films. The prepared films are studied and characterized by analysis of X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), energy dispersive X-ray spectroscopy (EDX), Raman spectroscopy, photoluminescence (PL), and UV–Vis–NIR spectroscopy. Following sulfurization, the XRD analysis shows the cubic phase of pyrite. The phase purity of the prepared samples are confirmed by Raman spectroscopy and the presence of Fe and S elements is verified by EDX analysis. The micrograph of FESEM shows that different morphologies in porous, spherical, and flower-like forms in nanometer dimensions are obtained by changing the effective parameters. The PL spectrum shows the presence of emission bands in the visible region. With the increase in the sulfurization temperature, the light absorption intensity of the films increases and the energy band gap increases from 1.53 to 1.73 eV, confirmed by UV–Vis–NIR spectroscopic analysis. The Mott-Schottky's analysis shows the p-type conductivity. Based on the results, the amount of photosensitivity, photoresponsivity, and specific detectivity increases with the rise in temperature. The sample sulfurized at 250 °C, compared to the sample sulfurized at 200 °C, shows a remarkable photoresponsivity in the range of visible spectrum. The values of photoresponsivity, photosensitivity, and specific detectivity at 100 mW/cm2 intensity are 22.7 mA/W, 18.80%, and 0.37×109 (Jones), respectively. According to the obtained results, this material has the potential for use in the fabrication of high-efficiency optoelectronic devices.

Method of Reduction Background Fluorescence in Human Fetal Brain Tissue and Quantitative Estimate of the Effect of Photobleaching.

We developed a method of reducing the background fluorescence of samples made from formalin-fixed and paraffin-embedded blocks of the brain of the second-trimester human fetuses. For reducing excess background fluorescence, the samples were subjected to photobleaching using an LED lamp with blue and red emission peaks in the range of visible spectrum in a construction of an original design. The decrease in the background autofluorescence was checked by measuring the intensity of the emitted background fluorescence of the samples and relative abundance of immunopositive structures after immunohistochemical staining. It was found that the proposed method reliably reduced the background fluorescence of the samples, which improved the quality of multicolor immunofluorescence images of the cerebral cortex.

Cross-spectral Gender Classification Using Multi-spectral Face Imaging

Soft biometrics has been gaining significant attention in biometrics literature for usage in recognition system. Gender classification is one such soft biometric traits that has been studied extensively using visible spectrum range and limited studies beyond visible spectrum. In this paper we present the cross-spectral gender classification using Multi-spectral imaging. We present this study using the facial images captured in nine narrow spectral bands ranging from 530nm to 1000nm. Further, we present an extensive benchmark evaluation based on state-of-the art linear Support Vector Machine (SVM) classifier for facial discriminative features in the cross spectral data in a robust manner. The extensive evaluation results based on 10 fold cross-validation indicates the highest average classification accuracy of 92.84% for cross-spectral study.

Synthesis and investigation of structural, optical, magnetic, and biocompatibility properties of nanoferrites AFeO2

Sol-gel method has been used for the synthesis of biocompatible superparamagnetic nanoferrites of AFeO2 (A = Li, Na, K, Ca). Structural study of the nanoferrites reveals that LiFeO2 exhibits cubic phase on the other hand NaFeO2, KFeO2, CaFeO2 nanoparticles possess orthorhombic phase. Transmission electron microscopy (TEM) suggests that synthesized nanoferrites are nano-sized with spherical morphology. Optical properties confirm that nanoferrites emit and absorb light in a visible range of the electromagnetic spectrum. International Commission on Illumination (CIE) study discloses that the nanoparticles can be used to produce light of various colors. Magnetic study reveals that the nanoferrites exhibit superparamagnetic nature with high values of saturation magnetization 40.26 emu/g, 41.69 emu/g, 57.16 emu/g, and 43.66 emu/g, respectively for LiFeO2, NaFeO2, KFeO2, and CaFeO2. Biocompatibility study of the nanoferrites has been performed using Sulforhodamine B (SRB) and 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay. The reason behind the observed properties and behavior has been discussed.

Tailoring the antifouling agent titanium dioxide in the visible range of solar spectrum for photoelectrochemical activity with hybrid DFT & DFT + U approach

Titanium dioxide (TiO2) doped with several metal dopants has been studied for photoelectrochemical water splitting and as a shielding agent to overcome the impact of biofouling on marine systems. The n-type TiO2 can be potentially used for water splitting; however, its wide band gap, weak light absorption, and low conductivity limit its applications for water splitting. Hybrid density functional theory (DFT) and DFT + U techniques have been used to investigate the structural parameters, light absorption, optical conductivity, thermodynamic stability, position of conduction, and valence-band edge of TiO2 doped with pristine and metal (Co, Fe, Ag, and Rh). The calculated band gap of pristine was 2.99 eV, and it could absorb photon with a wavelength of 414 nm and generate electron–hole pair, which reacted with water molecule and produced hydroxyl and oxygen ions. The presence of hydroxyl and oxygen ions on the pristine surface increased the antibacterial effect, thereby eliminating the biological toxicants in water. The incorporation of dopants, such as Co, Fe, Ag, and Rh, in TiO2 (2.1 %) significantly altered the properties, including the energy band gap from 2.99 eV to 1.25, 1.51, 1.99, and 2.06 eV, respectively. The narrow band gap and modified band positions were attributed to the new electronic states that appeared due to the dopant cations. The doped material showed significant optical absorption and photoconductivity in the entire visible and ultraviolet regions. Conduction- and valence-band edge locations of Ag-TiO2 facilitated water oxidation–reduction process. Moreover, higher negative free energy of Ag-doped TiO2 made it thermodynamically stable than other compounds. Consequently, the use of metal doping in TiO2 enhanced the optical absorption and photoconductivity owing to a lower band gap energy.

Detection of the organic solvent vapors by the optical gas sensors based on polyaminoarenes

The important problem to ensure the safety of life is the development of effective methods for monitoring of toxic gases in the atmosphere and industrial premises. To ensure such control, various gas sensors are developed that work on the effects of changes in electrical resistance, optical absorption or radiation in a certain spectral range. Most known gas sensors have high operating temperatures, which creates some difficulties in their operation, so more and more attention is paid to sensors based on conjugated electrically conductive polymers, in particular, polyaminoarenes. In result of absorption of inorganic polar gases such as ammonia, nitrogen oxide, hydrogen chloride and others the significant changes in conductivity, optical absorption and morphology of polyaminoarene films are observed. However influence of organic solvent vapors on the optical spectra of polyaminoarene films for today is poorly studied. In the present work the functional polymer films of polyanisidine (PoA) and polytoluidine (PoTI) are proposed as sensitive elements of optical sensors operating at room temperatures. The sensitive films on the transparent SnO2 surface were prepared by electrodeposition. The influence of vapors of organic solvents (dimethylformamide, tetrahydrofuran, chloroform, nitrobenzene, toluene) on the optical characteristics of PoTi and PoA films was established. The optical absorption spectra investigated PoA film was characterized by two band with maximum near 360–410 nm (π–π* transition) and broad band in the range of 620–950 nm which is a superposition of the second and third bands. Influence of organic vapors causes the changes in films coloration. The maximum of sensitivity to the organic vapors for PoTI films in all cases is observed at λ &gt; 550 nm and extends to near-infra-red area indicating a formation of free charge carriers of polaron type. Nonpolar solvent vapors insignificantly affect the optical properties of polyaminoarene films responсes to spectral changes in the visible and NIR range of spectrum. A highest gas sensitivity of optical signal was observed under influence of dimethylformamide and tetrahydrofuran vapors. The time to establish the steady-state value of the optical response is 30–60 s for PoTi, while for PoA reaches 120–180 s depending on the nature of organic vapors.

Fabrication of a carbon nanotube/tungsten disulfide visible spectrum photodetector.

Two-dimensional-material-based photodetectors are gaining prominence in optoelectronic applications, but there are certain factors to consider with bulk material usage. The demand for a highly responsive and highly efficient device with an inexpensive fabrication method is always of paramount importance. Carbon nanotubes (CNT) are well known, owing to their upheld vigorous structural and optoelectronic characteristics, but to fabricate them at a large scale involves multifarious processes. A visible range photodetector device structure developed using a simple and inexpensive drop-casting technique is reported here. The optoelectronic characteristics of the device are studied with IV measurements under the light and dark conditions by incorporating a thin CNT layer on top of tungsten-disulfide-based heterojunction photodetector to enhance the overall characteristics such as detectivity, responsivity, photocurrent, rise time, and fall time in the visible range of the light spectrum with a violet light source at 441 nm. In the DC bias voltage range of -20 to 20 V, IV measurements are carried out under dark and illumination conditions with different incident power densities. The threshold voltage is recognized at 2.0 V. Photocurrent is found to be highly dependent on the state of the incident light. For 0.3074mW/cm2 illuminated power, the highest responsivity and detectivity are determined to be 0.57 A/W and 2.89×1011 Jones. These findings encourage an alternative fabrication method at a large scale to grow CNTs for the enhancement of optoelectronic properties of present two-dimensional-material-based optoelectronic and photonics applications.

Field-Induced Assembly of sp-sp2 Carbon Sponges.

The formation of macroscale carbon structures characterised by an sp-sp-hybridization is realised by self-assembly in colloidal solutions under an effect of laser irradiation and electromagnetic fields. The sponge-like morphology, sculptured with gold nanoparticles (NPs) was revealed by Scanning Electron Microscopy (SEM) imaging. Full structural and defect characterization of the self-assembled sponges was provided using the micro-Raman spectroscopic technique. The synthesized clusters manifest themselves in the presence of a strong spectral band in the visible range of the photoluminescence spectra that is quite unusual for ordered sp-carbon systems.

High selectivity color filters based on bismuth enhanced plasmonic nanorods

In view of the low intensity of surface plasmon resonance in nanorod-array based color filters, we propose a Bi-SiO2-Ag nanorod array color filter, which takes advantage of the perfect absorption of the incident light by bismuth and the enhancement effect of metal–insulator–metal (MIM) cavity on localized surface plasmon resonance. By changing the thickness of silicon dioxide in the middle layer to adjust the resonance wavelength and using the COMSOL Multiphysics software to study and verify, we show that the proposed device can achieve filtering effect in the visible and near-infrared spectrum range, leading to up to 95% reflectivity in a specific wavelength range. In addition, the full width at half maximum (FWHM) of the device is considerably lower than that of traditional metallic materials, significantly reducing color crosstalk. Therefore, it can be used as a reflective color filter. The proposed structure has many potential applications in the fields of photoelectric detection, image sensing and display.

High electrical conductivity and breakdown current density of individual monolayer Ti3C2Tx MXene flakes

High electrical conductivity and breakdown current density of individual monolayer Ti3C2Tx MXene flakes

JU-VNT: a multi-spectral dataset of indoor object recognition using visible, near-infrared and thermal spectrum

Detecting objects in natural scenes can be a very challenging task. In several real-life scenarios it is often found that visible spectrum is not ideal for typical computer vision tasks. Going beyond the range of visible light spectrum, such as the near infrared spectrum or the thermal spectrum allows us to capture many unique properties of objects that normally not captured with a normal camera. In this work we propose two multi-spectral dataset with three different spectrum, namely, the visible, near infrared and thermal spectrum. The first dataset is a single object dataset where we have common desk objects of 25 different categories comprising of various materials. The second dataset comprises of all possible combination using these 25 objects taking a pair at a time. The objects are captured from 8 different angles using the three different cameras. The images are registered and cropped and provided along with classification and localization ground truths. Additionally classification benchmarks have been provided using the ResNet, InceptionNet and DenseNet architectures on both the datasets. The dataset would be publicly available from https://github.com/DVLP-CMATERJU/JU-VNT .