Ultraviolet-visible-near Infrared Research Articles

Structural and visible-near infrared optical properties of (Fe, Mo)-co-doped TiO2 for colored cool pigments

Fe and Mo co-doped TiO2 pigments were prepared via solid-phase synthesis, and the samples were characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), X-ray photoelectron spectroscopy (XPS), and ultraviolet–visible–near infrared (UV-VIS-NIR) spectrophotometer. The effects of coloring impurity Fe3+ and compensating impurity Mo6+ on the phase, morphology, chemical structure, and optical properties of TiO2 pigments were systematically studied—especially the mechanism of synergistic effects of visible light color and near-infrared reflectance of TiO2 pigments. The results showed that single doping of Fe3+ or Mo6+ could accelerate the transition of TiO2 pigment from anatase phase to rutile phase. In the (Fe, Mo) co-doped sample, the Mo impurity helped accelerate the A→R crystal phase transition of TiO2, but an excessive amount of Fe impurity could inhibit the phase transition process. The morphology and particle size of the samples were also affected by the type of impurity and the doping concentration. In addition, the doped impurities could form a strong characteristic absorption peak in the visible light spectrum to enhance the absorption of visible light. The sample then gradually changed from white to pink, white gray to orange, etc. In the near-infrared region, the impurity compensation effect between Mo6+ and Fe3+ could be utilized to reduce the free carrier concentration of the TiO2 pigment and weaken its near infrared absorption. By reasonably adjusting the relative contents of Fe and Mo impurities, the developed Ti0.98875Fe0.0075Mo0.00375O2 yellow pigment could finally yield a NIR reflectance of 96%.This is expected to meet the application requirements of colored energy-saving pigments.

Electrochemically triggered degradation of energetic material FOX‐7 (2,2‐dinitroethene‐1,1‐diamine) — Structural, redox, and spectrometric characterization in solution

AbstractThis work represents systemati11c electrochemical and spectrometric characterization of 2,2‐dinitroethene‐1,1‐diamine, the energetic material (explosive) known as FOX‐7, in aqueous as well as various organic solvents. On the basis of results obtained from combination of electrochemistry with ultraviolet‐visible–near‐infrared (UV‐vis‐NIR), infrared (IR), nuclear magnetic resonance (NMR), electron paramagnetic resonance (EPR), mass spectrometry (MS), gas chromatography (GC), and high‐performance liquid chromatography (HPLC) methods, the actual structure of FOX‐7 in various media was revealed, its reducibility was described, and radical intermediates as well as most of the products were intercepted and identified. Instead of expected cathodic reduction of the dinitro derivative, electrochemically initiated spontaneous degradation accompanied by release of gaseous products in all media was found.

Effects of Sb doping on the structure and properties of SnO2 films

Transparent heat-insulating SnO2 films were prepared on the glass substrate with sol-gel. The effects of Sb doping on the structure and photoelectric properties of the films were investigated. The films were characterized by scanning electron microscope (SEM), X-ray diffractometer (XRD), X-ray photoelectron spectroscopy (XPS), Ultraviolet–Visible-Near Infrared Spectrometer (UV-VIS-NIR) and Hall Effect tester. The results show that the doping of Sb did not change the basic crystal structure of the SnO2 film, but reduced the crystallinity of the film. With the increase of Sb doping, the grain size decreases first and then maintains basically invariable. The sheet resistance of the film decreases first and then increases. The transmittance of the substrate glass coated with this film (hereinafter referred to as the film's transmittance) in the near-infrared region (780–2500 nm) decreases from 92.55% to 60.48%, and increases a little when the doping amount exceeded 11 mol%. And its transmittance of visible light (380–780 nm) fluctuated slightly between about 81% and 86%.

Fabrication of black aluminium thin films by magnetron sputtering.

Black aluminium thin films were prepared by direct current (DC) pulsed magnetron sputtering. The N2 concentration in the Ar–N2 mixture that was used as the deposition atmosphere was varied from 0 to 10%, and its impact on the film growth and optical properties was studied. A strong change in the film growth process was observed as a function of the N2 concentration. At a specific N2 concentration of ∼6%, the Al film growth process favoured the formation of a moth-eye-like antireflective surface. This surface morphology, which was similar to the structure of a cauliflower, is known to trap incident light, resulting in films with a very low reflectivity. A diffuse reflectivity lower than 4% was reached in the ultraviolet-visible-near infrared (UV-VIS-NIR) spectral range that corresponds to a value observed for an ultrahigh absorber. We found that for the preparation of black aluminium, the nitrogen content plays an important role in film formation and the resulting film morphology.

Production of GaN/n–Si thin films using RF magnetron sputtering and determination of some physical properties: argon flow impacts

In this study, the gallium nitride (GaN) thin film was successfully deposited on the n − Si substrate using an RF magnetron sputter under various argon flows. Experimental techniques, such as field-emission scanning electron microscopy (FE-SEM), micro-Raman spectroscopy, ultraviolet/visible/near infrared (UV/Vis/NIR) spectroscopy, atomic force microscopy (AFM), and X-ray diffraction (XRD), were used to explore effects of argon flow on the GaN thin film growth and on some physical properties. XRD results proved that GaN thin film was polycrystalline in structure with (100) and (110) planes of hexagonal GaN. It was found that structural parameters (grain size, FWHM, crystal quality) of the thin film show a change with argon flows. The possible reasons of this were discussed. From the analysis of Raman results, E2 (high) optical phonon mode of hexagonal GaN was observed. From SEM analysis, surface properties of the thin film showed an almost homogeneous, granular structure with some agglomerations due to Van der Waals forces between particles. Change of argon flows slightly changed optical band gap energy of the thin film. Furthermore, it was analyzed and interpreted whether the experimental measurement results support each other. Morphological, structural, and optical properties of the GaN thin film can be changed by controlling the flow of argon.

Synthesis of polypyrrole nanorods via sacrificial removal of aluminum oxide nanopore template: A study on cell viability, electrical stimulation and neuronal differentiation of PC12 cells.

Synthesis of nanomaterials having uniform shape and size is a challenging task. Properties exhibited by such substrates would be compatible and homogeneous compared to the average properties displayed by those substrates with heterogeneous size. Herein, we report the synthesis of polypyrrole nanorods (PPy-NRs) of almost uniform size via oxidative chemical polymerization of pyrrole within anodized aluminum oxide nanopores followed by sacrificial removal of the template. Field emission scanning electron microscopy (FE-SEM), fourier transformed infra-red (FT-IR) spectra, X-ray diffraction (XRD), and ultra-violet-visible-near infra-red (UV-Vis-NIR) spectra of the substrate were used to analyze the physicochemical properties of as-synthesized PPy-NRs. PPy-NRs treated MC3T3-E1 and PC12 cells exhibited good biocompatibility in CCK-8 and live/dead assays. The assay showed more cell viability on PC12 cell lines. Electrical stimulation through PPy-NRs treated PC12 cells accelerated neuronal differentiation compared to those without electrical stimulation during in vitro cell culture.

Ultrafast Broadband Transient Absorption and Circular Dichroism Reveal Relaxation of a Chiral Copolymer.

We present a study of the photoinduced dynamics of the chiral polyfluorene-phenylene copolymer PFPh in THF and in cholesteric thin films. After photoexcitation at 370 nm in THF, ultraviolet-visible-near-infrared (UV-vis-NIR) transient absorption spectra show fast subpicosecond to picosecond intrachain migration of singlet excitons, solvation dynamics, and an exciton lifetime of 410 ps. The PFPh thin film features also interchain singlet exciton migration and exhibits shorter (2.1 and 240 ps) and longer lifetime components (2800 ps, interchain recombination). Furthermore, a setup for ultrafast UV-vis broadband transient circular dichroism (TrCD) spectroscopy has been developed. Fast supramolecular relaxation processes are observed, which are linked to changes in the anisotropic polarizability and pitch length of the cholesteric film. Such combined ultrafast transient CD and absorption experiments hold promise to reveal not only details of relaxation processes in supramolecular arrangements but also structural rearrangements of chiral molecular systems featuring CD signals in the UV-vis region.

Defect engineering for improved photocatalytic performance of reduced lead titanate (PbTiO3) under solar light irradiation

Lead titanate (PbTiO3) nanoparticles were prepared successfully by template free hydrothermal method. Size, crystallinity, morphology and phase determination of the nanoparticles were made by X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDS) and field-emission scanning electron microscopy (FESEM). FESEM results had shown that all nanoparticles were in the range between 20 to 40 nm size and found in the form of agglomerates. The average crystallite size of PbTiO3 nanoparticles was calculated to be nearly 35 nm. PbTiO3 nanoparticles were reduced by hydrogenation at high temperature to make the material active for visible light. Furthermore, optical absorbance of PbTiO3 nanoparticles was determined by applying ultraviolet-visible-near infrared (UV-Vis-NIR) spectroscopy. By using Davis-Mott model, the direct optical band gap of 2.65 eV was acquired. Methyl orange (MO) was used as pollutant to check the photocatalytic activity of reduced PbTiO3 nanoparticles under solar light irradiation. Photocatalytic activity of reduced PbTiO3 nanoparticles increased 2.6 times more than that of pure PbTiO3 nanoparticles for methyl orange (MO) under solar light irradiation. KEY WORDS: Lead titanate (PbTiO3), Photocatalytic performance, Hydrothermal growth, Solar light, Irradiation Bull. Chem. Soc. Ethiop. 2019, 33(2), 373-380.DOI: https://dx.doi.org/10.4314/bcse.v33i2.17

Synthesis and color properties of neodymium–doped holmium molybdate pigments with allochroic effect

A series of neodymium–doped holmium molybdate (Ho1-xNdx)2MoO6 (x = 0-0.8) color pigments with ‘allochroic effect’ were synthesized by a solid-phase reaction method under different conditions (i.e., sintering temperature, sintering time, and neodymium ions (Nd3+) doping amount). The as-synthesized pigments were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), thermogravimetry and differential scanning calorimetry (TG-DSC), ultraviolet–visible–near infrared (UV-VIS-NIR) spectrophotometry and CIE L*a*b* color scale. The results show that the adulteration of Nd3+ ions does not alter the crystal structure of Ho2MoO6 basically, but causes the lattice expansion for the pigments sintered at <1200 °C for 3 h. The pigments as powders or coatings on glass or ceramic tile have an allochroic effect under different illuminant sources (i.e., solar-light D65, incandescent lamp A, cool white fluorescent lamp F2 and three-band fluorescent lamp F11). For the pigment with Nd3+ ions doping amount of 0.2, the color difference (ΔE*) between standard illuminants D65 and F11 is 14.58, and the ΔE* value between any two standard illuminants is greater than 5.6, showing an intense allochroic effect. Based on the analysis of the abundant energy level structure of holmium ions (Ho3+) and Nd3+ ions and the spectral power difference of illuminant sources, the pigments have color variation under different illuminant sources. The pigments with a good thermal stability at high temperatures (i.e., 700–1200oC) can be used as promising functional pigments with ‘allochroic effect’ for glass or ceramic decoration.

In situ chemical analysis of geology samples by a rapid simultaneous ultraviolet/visible/near-infrared (UVN) + longwave-infrared laser induced breakdown spectroscopy detection system at standoff distance.

The standoff detection range of the simultaneous ultraviolet/visible/near-infrared (UVN) + longwave-Infrared (LWIR) Laser Induced Breakdown Spectroscopy (LIBS) detection system has been successfully extended from merely 10 cm to ≥ 1 meter by adopting a reflecting telescope collection scheme and UVN + LWIR LIBS emission signatures were acquired in various atmospheres from soil and mineral samples. This system simultaneously captured emission signatures from atomic, and simple and complex molecular target species existing in or near the same laser-induce plasma plume within micro-seconds. These pioneer standoff measurements of UVN + LWIR LIBS signatures have revealed an abundance of plasma-generated sample molecular emitting species in their vapor state along with atomic ones which gave intense and distinct signature emissions in both UVN (conventional LIBS) and LWIR (LWIR LIBS) spectral regions. A HITRAN simulation estimates the temperatures of those vapor molecular species to be around 2500 K. Laser-induced plasma emissions in the LWIR region provided direct information on the molecular components of the sample substances. The demonstrable capability of the LWIR LIBS on in situ characterization of carbon- and oxygen-rich materials is expected to find important applications in water discovery and organic materials signatures detection and identification. As a result laser ablation spectroscopy will be greatly augmented in both fundamental knowledge of and capability for chemical analysis.

Effect of pore size and porosity distribution on radiation absorption and thermal performance of porous solar energy absorber

In this paper, experimental and numerical study were both conducted to investigate the effect of pore size and porosity distribution on radiation absorption and thermal performance of porous solar energy absorber. Ultraviolet-visible-near infrared (UV-Vis-NIR) spectrophotometer was used to measure the transmittance of porous media to reflect its radiation absorption capabilities. Numerical model was established based on the assumption of thermal nonequilibrium condition as well as using P1 model to consider the radiation heat transfer. The UV-Vis-NIR spectrophotometer measurement showed that: (1) With smaller pore size, the spectral transmittance of the porous media would be lower and the solar radiation absorption would be better; (2) Among the materials with different pore size distributions, pore-size-decreased combo and pore-size-increased combo have almost equal absorption coefficient which are higher than that of uniform structure. Numerical simulation demonstrated that: (3) For materials with different pore size distributions, pore-size-decreased structure has the best radiation absorption due to its ability of maximizing the volumetric absorption effect, which is agreed with the UV-Vis-NIR spectrophotometer experimental results; (4) For materials with different porosity distributions, porosity-gradually-increased structure has the highest mean fluid/solid temperatures because it can utilize the enhanced convective/conductive heat transfer to improve the overall thermal performance of porous receiver; (5) Porous structure with pore-size-decreased distribution and porosity-gradually-increased distribution has the best thermal performance of which the mean temperatures of fluid/solid phases are the highest among all the studied cases.

Enhanced Photocatalytic Degradation of 2-Butanone Using Hybrid Nanostructures of Gallium Oxide and Reduced Graphene Oxide Under Ultraviolet-C Irradiation

Hybrid nanostructures made of gallium oxide (Ga2O3) and reduced graphene oxide (rGO) are synthesized using a facile hydrothermal process method, where the Ga2O3 nanostructures are well dispersed on the rGO surface. The formed Ga2O3-rGO hybrids are characterized via Field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), a diffuse reflectance Ultraviolet-visible-near infrared (UV-Vis-NIR) spectrophotometer, Brunauer–Emmett–Teller (BET), and photoluminescence (PL). Gas chromatography mass spectrometry (GC-MS) was used for analyzing volatile organic compounds (VOCs). The photocatalytic activity of the hybrid nanostructures is evaluated via the degradation of the 2-butanone, representing the VOCs under 254-nm radiation in the atmosphere. That activity is then compared to that of the Ga2O3 and commercial TiO2-P25. The Ga2O3-rGO hybrid shows enhanced photocatalytic degradation of 2-butanone compared to Ga2O3 and TiO2-P25, which is attributed to the enhanced specific surface area. The results indicate that the Ga2O3-rGO hybrid could be a promising method of enhancing photocatalytic activity and thereby effectively degrading VOCs, including the 2-butanone.

Preparation of hollow glass microspheres@ZnSxSe1−x or copper-/indium-co-doped ZnSxSe1−x composite color pigments with enhanced near-infrared reflectance

To improve the near-infrared (NIR) solar reflectance of ZnSxSe1−x or copper-/indium-co-doped ZnSxSe1−x (ZnSxSe1−x:Cu/In) pigment with various colors, hollow glass microspheres (HGMs)@ZnSxSe1−x or ZnSxSe1−x:Cu/In composite pigments with a litchis-like core-shell structure were prepared with HGMs dispersed and surface-corroded in an alkali-solution under ultrasound and ZnSxSe1−x or ZnSxSe1−x:Cu/In particles deposited on HGMs surface via in-situ co-precipitation and subsequent sintering. The structure, particle size, morphology, color properties and thermal performance of the composite pigments were investigated by X-ray diffraction (XRD), Fourier transfer infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), laser diffraction particle size analysis, scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), nitrogen gas adsorption method (BET), ultraviolet-visible-near-infrared (UV-VIS-NIR) spectroscopy and infrared irradiation image analysis. The results show that ultrasound can promote the corrosion of HGMs surface in alkali solution and form a mesh-pore structure, thus providing some heterogeneous nucleation sites on HGMs surface and favoring the nucleation of pigment precursors on HGMs surface in subsequent in-situ co-precipitation reaction. Compared to ZnSxSe1−x or ZnSxSe1−x:Cu/In pigments, HGMs@ZnSxSe1−x or ZnSxSe1−x:Cu/In composite pigments have a higher solar reflectance since the multiple layer reflections occur at the interface between the pigment particles and HGMs, thus leading to a better heat-reflective property. The NIR solar reflectance of HGMs@ZnSxSe1−x or ZnSxSe1−x:Cu/In composite pigments is 90.61 ± 0.052% or 73.13 ± 0.046%. The surface temperature of aluminum plate coated with HGMs@ZnSxSe1−x composite yellow pigment is 3.4 ± 0.2 °C or 9.6 ± 0.2 °C lower than that of aluminum plate coated or uncoated with ZnSxSe1−x pigment. This approach may shed a light on a promising composite structure design for high-performance solar reflective ‘cool materials’.

PVB/ATO Nanocomposites for Glass Coating Applications: Effects of Nanoparticles on the PVB Matrix

Films made of poly(vinyl butyral) (PVB) and antimony-doped tin oxide (ATO) nanoparticles (NPs), both uncoated and surface-modified with an alkoxysilane, were prepared by solution casting at filler volume fractions ranging from 0.08% to 4.5%. The films were characterized by standard techniques including transmission electron microscopy, thermogravimetric analysis and differential scanning calorimetry (DSC). In the polymeric matrix, the primary NPs (diameter ~10 nm) aggregate exhibiting different morphologies depending on the presence of the surface coating. Coated ATO NPs form spherical particles (with a diameter of 300–500 nm), whereas more elongated fractal structures (with a thickness of ~250 nm and length of tens of micrometers) are formed by uncoated NPs. The fraction of the polymer interacting with the NPs is always negligible. In agreement with this finding, DSC data did not reveal any rigid interface and 1H time domain nuclear magnetic resonance (NMR) and fast field-cycling NMR did not show significant differences in polymer dynamics among the different samples. The ultraviolet-visible-near infrared (UV-Vis-NIR) transmittance of the films decreased compared to pure PVB, especially in the NIR range. The solar direct transmittance and the light transmittance were extracted from the spectra according to CEN EN 410/2011 in order to test the performance of our films as plastic layers in laminated glass for glazing.

Early prediction of sugarcane genotypes susceptible and resistant to Diatraea saccharalis using spectroscopies and classification techniques.

The aim of this work was to use spectroscopic methods and partial least squares discriminant analysis (PLS-DA) for the early prediction of genotype resistance or susceptibility to sugarcane borer. The sugarcane leaf +1 was directly analyzed with no sample preparation by ultraviolet-visible-near-infrared (UV-VIS-NIR), middle-infrared (MID), and near-infrared (NIR) spectroscopies. Also, laser-induced breakdown spectroscopy (LIBS) was used to analyze pellets of dried and ground leaves and stalks of sugarcane. Classification models were built using PLS-DA. The models built using UV-VIS-NIR, MID or NIR spectra exhibited ideal sensitivity, specificity, and classification errors, i.e., 1 for both sensitivity and specificity and 0 for classification errors. Regarding the models built using LIBS spectra, those using spectra of pellets made from dried and ground leaves also presented ideal sensitivity, specificity, and classification errors; on the other hand, models built using the spectra of pellets made of dried and ground stalks did not present ideal values for these parameters. Thus, the models built, except for the one using LIBS of pellets made of stalks, showed excellent predictive capacity, making them suitable for predicting the resistance or susceptibility of sugarcane genotypes in the early stages of a plant's life.

Optical properties of zinc-iridium oxide thin films

We present the results of an investigation of ultraviolet, visible, near-infrared (UV-Vis-NIR) and X-ray absorption spectroscopy absorption spectra for zinc-iridium oxide (Zn-Ir- O) thin films with various iridium concentrations deposited by reactive DC magnetron sputtering. It is found that the absorption spectra of zinc-iridium oxide thin films contain a broad band with maxima at 446 nm and 710 nm in the visible region, bands with maxima at about 1100 nm and 3300 nm, and a low-intensity absorption band at 1570 nm in the near-infrared region. The obtained absorption bands are associated with iridium ions at valences of Ir3+, Ir4+ and Ir5+. Changes in the oxidation state of iridium ions from 5+ to 4+ are observed.

Structure characterization and photoluminescence of sol-gel synthesized Ag-Dy-codoped silica phosphor

Bulk samples of single Ag-, Dy-doped and Ag-Dy-codoped silica matrices were synthesized using the sol-gel processing. These matrices were characterized using X-ray diffractometry, ultraviolet-visible-near infrared (UV-VIS-NIR), Fourier transform infrared, photoluminescence (PL) excitation and emission spectroscopic techniques. High resolution transmission electron microscope confirmed the presence of fine spherical Ag nanoparticles (NPs), whose average size is approximately 10–15 nm, in the Ag-doped and Ag-Dy-codoped silica matrices. UV-VIS-NIR spectra revealed absorption peaks due to Dy3+ active centers in addition to the surface plasmon resonance bands of Ag NPs centered at 410 and 452 nm in these matrices, respectively. UV-excited PL of the materials was studied and compared. Near-white light emission, which was assessed by the calculated CIE chromaticity coordinates, could be observed under UV excitation at 365 nm in the Ag-Dy-codoped silica matrix. This white light was realized by appropriate combination of prominent yellow and blue emissions. Electron spin resonance spectra revealed paramagnetic spin states for Ag which can be attributed to the quantum size effect of very fine Ag NPs dispersed in the silica network. The obtained results indicate that the Ag-Dy-codoped silica phosphor could be a promising candidate for application as white light emitting phosphor for UV LED chips.

Perovskite/Organic Bulk-Heterojunction Integrated Ultrasensitive Broadband Photodetectors with High Near-Infrared External Quantum Efficiency over 70.

Ultraviolet-visible-near infrared (UV-Vis-NIR) broadband detection is important for image sensing, communication, and environmental monitoring, yet remains as a challenge in achieving high external quantum efficiency (EQE) in the broad spectrum range. Herein, sensitive broadband integrated photodetectors (PDs) with high EQE levels are reported. The organic bulk-heterojunction (OBHJ) layer, based on a NIR sensitive organic acceptor, is employed to extend the response spectrum of the perovskite PDs. A key strategy of introducing dual electron transport materials respectively for Vis and NIR regions into the active layer of integrated PDs is applied. Further combined with the proper energy level alignment and reasonable distribution of PC61 BM in the active layer, the extraction and transport of photo induced charges in between perovskite and OBHJ is promoted efficiently. The integrated PD with the optimized structure exhibits an EQE mostly beyond 70% in the Vis-NIR region, which is the highest value among the ever reported solution-processable broadband PDs. The highest responsivity is 0.444 and 0.518 A W-1 in the Vis and NIR region, respectively. The specific detectivity is beyond 1010 Jones in the range from 340 to 940 nm, enabling the device to detect weak signals in the UV to NIR broad region.

Densely Charged Dodecacationic [3]- and Tetracosacationic Radial [5]Catenanes

Summary Here, we report the efficient syntheses of a dodecacationic [3]catenane, which consists of three mechanically interlocked 4+ charged rings despite their mutual Coulombic repulsion, and a tetracosacationic radial [5]catenane, which consists of four 4+ charged rings mechanically interlocked around an 8+ charged ring and bears up to 24 positive charges in its co-constitution. The solid-state structures, determined by single-crystal X-ray crystallography, show that the two mechanical bonds in the [3]catenane result in the nano-confinement of 12 positive charges within a volume of less than 1.65 nm3, corresponding to 7.3 positive charges per nm3, whereas the radial [5]catenane has a charge density of 6.0 positive charges per nm3 and a molecular length of up to 3.7 nm. The template-directed strategy for constructing mechanically interlocked molecules, consisting of multiply charged rings, represents a departure in chemistry tantamount to producing a blueprint for exploring a novel class of organic molecules that boast large numbers and high densities of like charges.

An ultraviolet-visible-near infrared overview spectroscopy for divertor plasma diagnosis on Wendelstein 7-X

A new ultraviolet-visible-near infrared (UV-VIS-NIR) overview spectroscopy has been developed for routinely monitoring divertor recycling, intrinsic and extrinsic impurity fluxes on Wendelstein 7-X (W7-X). The overview spectroscopy is part of a large integrated system which allows several diagnostic systems to share the same field of view through an endoscope. During the first divertor operation phase on W7-X, a temporary view port was setup for the overview spectroscopy in order to investigate the divertor plasmas and provide reference data for the commissioning of the whole integrated endoscope system. The overview spectroscopy uses a 5-channel spectrometer to cover the wavelength range 300-1100 nm. The reciprocal linear dispersion of the spectrometer are in the range of 0.04-0.19 nm/pixel. The spatial coverage of the system is 10 cm in the vertical direction and 20 cm in the toroidal direction. The first full spectral survey identified H, He, C, O, Fe, Ne, N and Ar lines. The temporal evolutions of hydrogen and impurity radiation with maximum 10 ms resolution were obtained. Spectra fall in the range of filter transmission curves have been investigated for the filter camera systems which will be commissioned along with the endoscope in the next operation phase.