Shape Of Nanospheres Research Articles

Formation of Gold Bone Nanorods shape using copper as foreign metal ion

In this study, copper (Cu) is introduced as a foreign metal ion replacing platinum by modifying the recipe of GNBPs and the final structure obtained is gold bone nanorods (GBNRs). The aspect ratio and surface density of GBNRs were investigated by varying the growth time during the growth process from 30 minutes to 5 hours. It was found that the growth solution has been changed from colourless to light blue and violet colour with increasing growth time, indicating the formation of GBNRs. The UV-Vis analysis shows two resonance plasmon peaks for t-SPR and l-SPR at 583 nm and 766 nm with the intensity of 1.433 a.u and 2.236 a.u at the optimum 5 hours growth time. For morphological analysis, it was found that the sample with lower growth time produced gold nanosphere shapes and with increasing time, more GBNRs with large aspect ratios were produced. HR-TEM characterization reveals that bone nanorods are formed due to the influence of Cu foreign metal ions, which cause selective deposition of Au atoms onto {111} facet of gold nanorods, while simultaneously reducing the overgrowth rate of the {110} facet for the edge regions and the {100} facet for the tip regions of the nanorods. In addition, the influence of Cu foreign metal ions on the growth mechanism of Au nanoseeds into nanorods and the shape transformation of nanorods into bone nanorods are also discussed in this work. In conclusion, the GBNRs have been successfully synthesized using SMGM by induced Cu as foreign metal ions.

CuCo2O4/CuO Heterostructure with Oxygen Vacancies Induced by Plasma for Electrocatalytic Nitrate Reduction to Ammonia.

Electrochemical nitrate reduction (NO3RR) to ammonia production is regarded as one of the potential alternatives for replacing the Haber-Bosch technology for realizing artificial ammonia synthesis. In this study, a CuCo2O4/CuO-Ar heterostructure in the shape of dandelion nanospheres formed by nanoarrays has been successfully constructed, demonstrating excellent NO3RR performance. Experimental results indicate that Ar plasma etching of CuCo2O4/CuO-Ar significantly increases the content of oxygen vacancies compared to the sample of CuCo2O4/CuO-Air etched by air plasma, resulting in improved NO3RR performance. Density functional theory calculations further confirm that the existence of more oxygen vacancies effectively decreases the energy barrier of nitrate adsorption, which is due to the generation of more oxygen vacancies facilitating nitrate adsorption and weakening the N-O bonds of nitrate after plasma treatment. As a result, CuCo2O4/CuO-Ar exhibits a high NH3 yield of 0.55 mmol h-1 cm-2 and a Faraday efficiency of 95.07% at the optimal potential of -0.9 V (vs RHE) in a neutral medium. Importantly, CuCo2O4/CuO-Ar also showcases excellent electrocatalytic stability. This study presents new views on the design and structure regulation of NO3RR electrocatalysts and their potential applications in the future.

The impact of temperature and frequency on negative capacitance and dielectric attributes in NiCo2O4 bulk ceramic

This paper presents a complete analysis of the electrical and dielectric characteristics of NiCo2O4 (NCO) bulk ceramic synthesized by the co-precipitation process as a future electronic device material. The structural analysis following the synthesis process revealed the formation of cubic-phase spinel NCO in the shape of nanospheres, with an approximate diameter of 25 nm. The present study aimed to examine the relationship between capacitance and conductance for the NCO under investigation, focusing on their frequency and temperature dependencies. The frequency range of interest ranged from 100 Hz to 1.5 MHz, while the temperature range considered was from 300 K to 450 K. The C/f plot has exhibited the phenomenon of negative capacitance, which may be attributed to the augmentation of polarization and the incorporation of additional minority carriers inside the structure. The dielectric parameters, such as permittivity, dielectric loss, alternating current conductance, and electrical modulus, were determined by capacitance and conductance measurements, taking into account their frequency and temperature reliance. All dielectric calculations were influenced by negative capacitance measurements. The negative capacitance feature of NiCo2O4 is attributed to the ferroelectric properties of the Ni and Co elements in its composition. In conclusion, this paper has made a valuable contribution to the existing body of literature by enhancing our comprehension of the negative capacitance behavior and dielectric characteristics of the NCO.

Cr2O3- TiO2 nanocomposite made using plant (Oats) extract via impregnation technique for photocatalytic activity of hydrogen production

In this study an efficient photocatalyst of water splitting was developed. It's discussed. The Cr2O3 with TiO2nanoparticles (Cr2O3-TNPs) nanocomposite with (Oats extract) were created using ecologically friendly methods impregnation technique such TiO2 exhibits nanospherical (TNPs) shape structure. This nanocomposite material enhanced their ability to absorb ultraviolet light while also speeding up the recombination of photogenerated electrons and holes, according to the researchers. The TNPs and prepared Cr2O3-TNPs were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), energy dispersive x-ray spectroscopy (EDX), and UV-visible absorbance. The XRD of TNPs showed a Tetragonal phase with 8.9 nm of average crystallite size,. FE-SEM images showed that the average particles size in the range of 22.5 nm and UV-VIS absorbance have energy gaps are 3.9eV while the energy gaps of Cr2O3-TNPs smaller than that 3.6 eV. It was found that the performance of photocatalysts of the nanocomposite for hydrogen generation was superior, as it gave the highest rate of hydrogen production (6.3) ml at 80 min when exposed to ultraviolet light. Moreover, the nanocomposite revealed the high H2 production rate under ultraviolt light irradiation (λ < 400 nm), The Cr2O3-TNps have a high photocatalytic effectiveness due to their wide ultraviolt light photoresponse range and excellent separation of photogenerated electrons and holes.

Antibacterial activity of silver nanoparticles synthesized from Citrus aurantium and its synergistic effect of the combination of silver nanoparticles with ampicillin against Proteus mirabilis

Abstract Background: Proteus mirabilis is one of the most infectious organisms that cause a various infections involving those of the skin, wounds, and urinary tract. This study describes the synthesis of silver nanoparticles (AgNps) and using it as an antibacterial agent. Objective: To determine the activity of AgNps and synergistic effect of combination of AgNps with ampicillin (AMP). Materials and Methods: Out of 205 samples, 32 isolated were identified as P. mirabilis and determine the inhibition zone by using AgNps and its combination with AMP. The AgNps were biosynthesized by Citrus aurantium and then characterized using Ultraviolet (UV)-visible spectroscopy, X-ray diffraction (XRD) and transmission electron microscope (TEM). The antibacterial activity of AgNps was done using well diffusion agar method and the activity was evaluated by calculating the increase in the inhibition zone and reduction in the bacterial growth. Results: The synthesized AgNps was first characterized by UV-visible spectroscopy which showed a peak between 400 and 500 cm–1. The color changes from clear yellow to red or brown color indicate the formation of AgNps. The particle size of AgNps was calculated and found to be 21.24 nm by XRD. The TEM images showed the presence of very regular particles in shape of nanospheres with a particle size in the range of 10–28 nm. Different concentrations (25, 50, 75, 100 µg/mL) were used for determining the activities of AgNps and the combination of AgNps with AMP, and the result showed that the most efficient in inhibition zone was at concentration 100 µg/mL. Conclusion: This study concluded that the green synthesized AgNps from C. aurantium leaves extract have most potential as antibacterial against P. mirabilis.

Highly Controllable Fabrication of Gold Composite Nanostructures by Multiple Electroplating for High‐Performance Electrochemical and Raman Scattering Measurements

Morphology‐controlled nanostructures are important functional materials in multidisciplinary research fields, such as sensing, imaging, catalysis, and energy harvesting. However, existing nanofabrication methods have limitations in terms of controllability, diversity, cost, and efficiency. Here, a novel nanofabrication approach is proposed to construct Au nanostructures with high controllability, cost‐efficiency, and high‐performance sensing and energy harvesting. The fabrication incorporates electric field‐assisted hydrothermal growth of zinc oxide nanorods (ZnO NRs) with two‐step gold electroplating. The ZnO NRs serve as a dissolvable template during the electroplating formation of gold nanostructures for eventually synthesizing pure gold nanostructures on electrodes. The synthesized gold nanostructures take unique composite shape of nanospheres (hundreds of nanometers) covered with tinier nanostructures (tens of nanometers) like floccules, grains, lamellas, or rods, which are highly controlled by regulating electroplating parameters. The gold composite nanostructures provide high‐performance sensing and energy harvesting, such as enhanced electrochemical sensing interface (electric double‐layer impedance decrease up to 97.1%), excellent surface‐enhanced Raman scattering (SERS enhancement factor up to ), and preferable visible–near‐infrared light harvesting (absorptivity near to 90%). For the first time, the application of tumor cell photothermal therapy with nanostructured electrodes and in situ bimodal monitoring of single‐cell impedance and SERS‐based molecular expression during therapy is demonstrated.

Bimetallic nickel-cobalt nanospheres electrodeposited on nickel foam as a battery-type electrode material for fabrication of asymmetric supercapacitors

The development of electrode materials with nanostructures is of great importance in the field of supercapacitors. In the present research, the direct simultaneous deposition of Ni-Co nanosphere (Ni-Co NS) on nickel foam as a substrate has been performed by facile one-step electrodeposition method without any template to provide excellent electrical conductivity and efficiency of electrode materials. The SEM images of Ni-Co NS electrode showed a nanosphere shape. The electrochemical performance of the electrodeposited nanosphere has been investigated by cyclic voltammetry, galvanostatic charge-discharge, and electrochemical impedance spectroscopy in 3 M KOH aqueous electrolyte. The Ni-Co NS electrode showed a good specific capacity of 564.6 C g−1 at 2 A g−1 with rate capability of 70% in the current density range of 2–20 A g−1, reasonable cyclic stability of 86% after 5000 cycles at the scan rate of 70 mV s−1, low internal resistance, and high surface area of the nanospheres. Interestingly, an asymmetric supercapacitor fabricated using Ni-Co NS and activated carbon as the positive and negative electrodes, respectively, operating at the potential window of 1.5 V delivered high energy and power densities of 34.5 Wh kg−1 and 683 W kg−1, respectively.

Development and performance analysis of a 316 stainless steel autoclave for facile fabrication of carbon nanoarchitectures derived from natural potato and starch

In this study, we describe a facile hydrothermal method for synthesis of carbon nano-arrays, using materials available locally, resulting in an affordable autoclave system. Stainless steel type 1.4401 (with grade 316) possesses high temperature mechanical properties and anticorrosion characteristics and is therefore appropriate for autoclave device construction. For analysis, a systematic study of the three Von Misses stress models of an autoclave system was performed using Abaqus software. Also, the effect of the component's thickness on the stress concentration was examined. This was done to find the most optimal mode of the autoclave's resistance to stress caused by temperature and pressure. So, for further evaluation of this reactor in the laboratory, a series of experiments was designed. It is interesting to find that natural potato and chemical starch as low-cost precursors play a vital role in constructing carbon-based nanomaterials. In this study, by utilizing natural extracts and chemical precursors, the potential of designed autoclave systems has been explored in the fabrication of carbon materials with diverse shapes of nanorods and nanospheres. The structural, chemical compositional and morphological changes of the products were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), energy-dispersive X-ray spectroscopy (EDS), field emission scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM) analyses. As the precursor was changed, a significant difference was observed in the shape and morphologies of the black nano-products. Such results suggest competition between designed and commercial autoclaves in the fabrication of nanomaterials. More importantly, these structure-controlled carbon nanomaterials with unique properties can be explored in many practical applications.

Cytotoxic and Apoptotic Effects of Polyethylene Nanoparticles on Normal Monkey Kidney Vero E6 Cell Line

Background: Nanoplastics (NPs) become one of the most threatening substances for living organisms in the aquatic and terrestrial environments. Due to their small size and high surface area, few studies have revealed their toxic impact on mainly marine organisms. However, there is scarcity on NPs impact on mammalian cells. Methods: We used 200-900 nm polyethylene nanoparticles (PE-NPs) to evaluate their cytotoxic and genotoxic effects on mammalian Vero E6 cell line using MTT and Comet assays. Result: Characterization of the selected PE-NPs confirmed their nano spherical shape, size and their low-density type. Serial dilution of PE-NPs decreases cell viability with 50% inhibition concentration (IC50) 91 μg/mL (at 24 h sampling time), 26 μg/mL (48 h) and 22 μg/mL (72 h) and an average IC50 = 46 μg/mL. Treatment of Vero E6 cells with the average IC50 significantly affects the genomic integrity by decrease of % DNA in head, increase of % DNA in tail, tail length (μm) and tail moment, in a time-dependent manner. Therefore, PE-NPs of the low-density type, that is widely used in different products including coatings and films, have cytotoxic and genotoxic effect on mammalian cells. NPs deserves more attention and further studies are needed to focus on their molecular mechanisms in vitro.

Mie-Resonant Rutile TiO2 Nanospheres for Unclonable Structural Colors

Monodisperse carbon-embedded rutile TiO2 nanospheres were synthesized through the sol–gel reaction of titanium alkoxide in concert with dodecylamine and the subsequent thermal annealing process in inert gas. Since dodecylamine was uniformly carbonized in nanospheres, the growth of rutile crystals was limited to ∼50 nm in the thermal annealing process, which enabled us to keep the spherical shape of nanospheres. Due to the size and shape uniformity, colloidal films of these rutile TiO2 nanospheres showed unique Mie-resonant structural colors, in which multiple scattering was suppressed due to carbon embedded in nanospheres. Due to the high refractive index of rutile TiO2, there were multiple backscattering peaks in the visible region, which make it extremely difficult to replicate the colorimetric information when they were utilized as encryption inks. Finally, we demonstrated that IR-reflective carbon-embedded rutile TiO2 nanospheres can be used as automotive paints, which can be distinguishable at night for light detection and ranging (LiDAR) systems.

The Therapeutic Role of Nanoparticle Shape in Traumatic Brain Injury : An in vitro Comparative Study.

ObjectiveTo perform a comparative analysis of therapeutic effects associated with two different shapes of ceria nanoparticles, ceria nanorods (Ceria NRs) and ceria nanospheres (Ceria NSs), in an in vitro model of traumatic brain injury (TBI). MethodsIn vitro TBI was induced using six-well confluent plates by manually scratching with a sterile pipette tip in a 6×6-square grid. The cells were then incubated and classified into cells with scratch injury without nanoparticles and cells with scratch injury, which were treated separately with 1.16 mM of Ceria NSs and Ceria NRs. Antioxidant activities and anti-inflammatory effects were analyzed. ResultsCeria NRs and Ceria NSs significantly reduced the level of reactive oxygen species compared with the control group of SH-SY5Y cells treated with Dulbecco’s phosphate-buffered saline. The mRNA expression of superoxide dismutases was also reduced in nanoparticle-treated SH-SY5Y cells, but apparently the degree of mRNA expression decrease was not dependent on the nanoparticle shape. Exposure to ceria nanoparticles also decreased the cyclooxygenase-2 expression, especially prominent in Ceria NR-treated group than that in Ceria NS-treated group. ConclusionCeria nanoparticles exhibit antioxidant and anti-inflammatory effects in TBI models in vitro. Ceria NRs had better antiinflammatory effect than Ceria NSs, but showed similar antioxidant activity.

Antagonistic effect of electrochemical corrosion on the mechanical wear of Monel 400 alloy in seawater

The tribocorrosion behavior as well as the corrosion-wear interaction of Monel 400 alloy in seawater were investigated under varied loads. An abnormal antagonistic effect of corrosion on wear was found, which was highly related to the peculiar corrosion products in the shape of nanospheres only generated under the tribocorrosion condition due to the selective corrosion of Ni-rich components. A boundary lubrication layer, consisting of the nanospheres squeezed and spread by friction stress, leaded to the reduction of friction coefficient. Moreover, the material loss rate was greatly alleviated because the friction-induced surface delamination and sub-surface crack propagation were prevented.

Shape dependent sensing potential of gold nanoparticles in etching based multicolorimetric plasmonic-ELISA.

In the present study, a systematic investigation has been carried out for the first time to assess the potential of three different shapes of gold nanoparticles (AuNPs), viz. nanorods (AuNRs), nanotriangles (AuNTs), and nanospheres (AuNSs), to develop a horseradish peroxidase (HRP) enzyme-mediated etching-based plasmonic ELISA (p-ELISA) strategy. The etching of the AuNPs in ELISA is achieved by 3′-3-5′-5-tetramethylbenzidine (TMB2+), which is produced by the biocatalytic conversion of chromogenic TMB via HRP. All three types of AuNPs were interacted with varying concentrations of TMB2+ (7–131 μM) (product of HRP enzyme reaction) and characterized for visible color change and by UV-Vis spectroscopy and transmission electron microscopy (TEM). From the comparative analysis of all three shapes of AuNPs, AuNRs exhibited vivid visible color change and absorbance intensity change compared to spherical and triangle-shaped nanoparticles. The TEM analysis of the etched nanoparticles revealed the gradual etching pattern of AuNRs compared to AuNTs which resulted in multicolor generation as opposed to AuNTs where the etching was relatively very fast and thus shows a faster shape transformation and poor color discrimination. Further, the potential of the AuNR etching-based optimized strategy was successfully demonstrated to develop an indirect competitive p-ELISA for human IgG detection. The developed p-ELISA showed an ultra-low visual limit of detection of 1 fg mL−1 (∼6.54 aM) without the aid of any sophisticated instruments. In the future, the developed competitive p-ELISA strategy can be easily employed to develop cost-effective, portable, and point-of-care assays for the detection of various disease biomarkers with ultra-high sensitivity.

Easy Fabrication of Amorphous Covalent Organic Nanospheres Using Schiff-Base Chemistry for Iodine Capture.

Designing a strategy for easy fabrication of amorphous porous organic polymers (POPs) with regularly nanospherical structure using common chemical raw materials is highly imperative to promote the practical application for iodine capture. Uniform covalent organic nanospheres (CONs), defined as CON-TT, were easily prepared at room temperature via a Schiff base condensation reaction of tri(4-aminophenyl) methane (TAPM) and terephthalaldehyde (TPA) catalyzed by acetic acid. The obtained CON-TT exhibits a uniform nanospherical shape, high specific surface area, effective imine sorption sites and abundant benzene rings. An excellent reversible iodine adsorption capacity of 4.80 g g-1 is achieved, which can be attributed to the hybrid of physisorption and chemisorption process. We anticipate that this work can provide general guidance for the industrial large-scale preparation of other CONs for iodine capture.

Characterization of cellulose and cellulose nanofibers isolated from various seaweed species

Crude and α- and β-cellulose yields were estimated in six macroalgal species belonging to various groups growing in the Mediterranean coast, Egypt. The extracted cellulose yield varied between 11.70% dry weight (DW) for Colpomenia sinuosa and 1.38% DW for Jania rubens. The results revealed that α-cellulose represented the major proportion “43%” to “74%” of cellulose, while β–cellulose represented the minor proportion “2.3%” to “12%”. Cellulose nanofibers (CNFs) were prepared from crude cellulose via acid hydrolysis, and the yield was calculated as “47.74%” to “9.13%”. The seaweed cellulose and CNFs of the maximum-producing species were morphologically characterized via scanning electron microscopy (SEM). The shapes of the extracted cellulose ranged from filaments and plates to web-like structures according to the seaweed species and cellulose fractions. The CNFs exhibited nanosphere shapes, with the average size ranging from 14.94 to 30.82 nm. Chemical analysis of the prepared cellulose performed via Fourier-transform infrared spectrometry (FTIR) demonstrated the similarity between crude and α- and β-cellulose. The CNFs were investigated via Ultraviolet–visible spectroscopy and surface plasmon resonance (SPR) bands, which confirmed the spherical shape of the prepared CNFs. In conclusion, the selected seaweeds can be used as a renewable source of dietary fibers and CNFs with economic applications. Further studies are required to screen numerous species of seaweeds for large-scale production of cellulose.

Synthesis and characterization of MgO nanoparticle via microwave and sol-gel methods

This investigation aims to study the characterization of MgO nanoparticles prepared using two different routes via microwave method and sol-gel route. The characteristics of the fabricated of MgO nanoparticles were examined by FESEM, XRD, FTIR and BET. The results of XRD for microwave method and sol-gel route revealed peaks indicating the uniform crystalline. The images of FESEM of MgO nanoparticles by microwave method evinced an irregular shape, but the MgO nanoparticles synthesized by sol-gel route were found crystallites, nano spherical shape. The results of this work manifested that the MgO nanoparticles prepared via sol-gel route had smaller grain size as (≈ 50 nm) compared to the microwave method (≈ 72 nm). The specific surface area of the MgO nanoparticles using sol-gel route was more than with microwave route. FTIR examination reveals that the presence of Mg-O in the sample.

Novel sol-gel synthesis of CeO2 nanoparticles using Morinda citrifolia L. fruit extracts: Structural and optical analysis

An efficient and eco-friendly sol-gel method using Morinda citrifolia L. fruit extracts as a weak base source, oxidizing, and capping agents were reported to synthesize cerium oxide nanoparticles (CeO2 NPs). CeO2 NPs exhibited the FCC crystal phase and the nanospherical shape with an average size of 51.6 nm. FT-IR characterization presented the absorption band of Ce–O at 705 cm−1 and the stretching vibration of N-H amine, which plays a crucial role in CeO2 NPs synthesis. The optical analysis revealed a strong optical absorption of CeO2 NPs at 351 nm with a bandgap value of 3.48 eV. Furthermore, the optical analysis of CeO2 NPs was further tested for the UV light absorption ability via methylene blue degradation. As a result, CeO2 NPs pointed out a low photocatalytic property with an efficiency of 10.25 and 9.46 % under UVA and UVB light irradiation for 15 h, respectively. Meanwhile, CeO2 NPs had good optical properties on their photoabsorption ability toward UVA and UVB light with an efficiency of 89.27 and 67.55 %, respectively.

Enhanced photocatalytic degradation of organic pollutants and hydrogen production by a visible light–responsive Bi2WO6/ZnIn2S4 heterojunction

In this work, we have reported the photocatalytic applications of the direct Z-scheme Bi2WO6/ZnIn2S4 heterojunction in the degradation of organic pollutants and the production of H2 gas. The nano-spherical shape of Bi2WO6 and porous structure of ZnIn2S4 particles, synthesized using cyclic microwave radiation method, facilitated the intimate interfacial contact of the heterojunction. Consequently, the photocatalytic activity of Bi2WO6/ZnIn2S4 towards degradation of salicylic acid (SA) and methylene blue (MB), the models of non-dye and dye organic pollutants, were maximized after introducing only 12.5%wt of Bi2WO6.Similarly, this photocatalyst demonstrated an enhancement in H2 production in comparison to the single-component photocatalysts. Furthermore, this photocatalyst maintained a high photoactivity after three repeated cycles for MB degradation and H2 production. The enhanced photo-efficacy of this heterojunction originates from the improved separation and transportation of photogenerated e−/h+ through a direct Z-scheme system. This was evidenced by electrochemical analyses and active species trapping experiments, combined with the consideration of reduction potential of reactive oxygen species.

The high electrochemical performance of N-doped active carbon with the shape of nanospheres in 1-ethyl-3-methylimidazolium tetrafluoroborate

In our investigation, N-doped active carbon with the shape of nanospheres with a diameter of 85 nm was synthesized. The TEM image shows that the NAC has graphitic regions and the surface graphitic (002) plane can be observed. The specific surface area of NAC was 2256 m2/g. XPS demonstrated that elemental nitrogen (pyrrolic-N, pyridine-N, quaternary-N) was successfully doped into the active carbon structure with a total N content of 8.1%. The sample was tested in a symmetrical system in 1 M LiClO4/acetonitrile electrolyte and 1-ethyl-3-methylimidazolium tetrafluoroborate. It showed a high specific energy density of 65.3 Wh/kg, due to the high potential window in the 1-ethyl-3-methylimidazolium tetrafluoroborate. It could retain 95% of the initial capacitance even after 8000 cycles.

Facile Synthesis of Substantially Magnetic Hollow Nanospheres of Maghemite (γ-Fe2O3) Originated from Magnetite (Fe3O4) via Solvothermal Method

In the present study, we report on the successful synthesis of hollow nanospheres of maghemite (γ-Fe2O3). The γ-Fe2O3 hollow nanospheres were synthesized by annealing magnetite (Fe3O4) hexagonal nanoparticles produced by solvothermal method. Structural analysis by slow-scan X-ray diffraction (XRD) marks a small peak shift towards high angle confirming the change in the iron oxide phase from Fe3O4 to γ-Fe2O3. Further, FT-IR spectroscopy reveals for Fe3O4 a band at 571 cm−1, which shows the Fe-O stretching mode of tetrahedral and octahedral sites. Formation of γ-Fe2O3 upon annealing was again confirmed from the broadening and splitting of band 571 cm−1 into two bands, viz. 556 cm−1 and 637 cm−1. Magnetic properties of the synthesized samples were studied using a vibrating sample magnetometer (VSM) at 300 K. The value of saturation magnetization (MS) of Fe3O4 nanoparticles and γ-Fe2O3 hollow nanospheres was 56 emu/g and 43 emu/g, respectively. For Fe3O4, infrequent Verwey transition appeared when variation in magnetization with temperature was studied. Morphological analysis confirms the hexagonal shape of Fe3O4 nanoparticles with an average particle size of 57 nm. The same study interestingly epitomizes a hollow nanospherical shape with an average particle size of 12 nm for γ-Fe2O3. The emergence of the Verwey transition in Fe3O4 hexagonal nanoparticles and the existence of significant magnetization of 43 emu/g in hollow nanospheres of γ-Fe2O3 in this study are contentious and fascinating for possible applications.