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Author

J. Gajendiran

Other affiliations: Techno India
Bio: J. Gajendiran is an academic researcher from Presidency University, Kolkata. The author has contributed to research in topics: Materials science & Scanning electron microscope. The author has an hindex of 7, co-authored 30 publications receiving 202 citations. Previous affiliations of J. Gajendiran include Techno India.

Papers
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Journal ArticleDOI
TL;DR: In this paper, the effects of calcined temperatures on the structural and magnetic properties of CoFe2O4 nanostructures were studied by XRD and VSM analysis and the functional groups of as prepared and calcined sample were identified by the FTIR spectra analysis.

68 citations

Journal ArticleDOI
TL;DR: In this paper, the structural and optical properties of the ZnO/CuO nanocomposite were studied by X-ray diffraction (XRD), Fourier transform infrared spectra (FTIR), Transmission electron microscope (TEM) and Photoluminescence spectroscopy (PL).

59 citations

Journal ArticleDOI
TL;DR: In this article, the crystal structure, functional groups, morphology, and photoluminescence properties of aggregated tin oxide (SnO2/SnO) nanostructures are characterized by X-ray diffraction (XRD), Fourier transform infrared (FTIR), Energy dispersive Xray (EDX), scanning electron microscopy (SEM) and Photolumine (PL) analysis.

29 citations

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TL;DR: In this article, the authors used a mild hydrothermal method in the presence of the surfactant sodium dodecyl sulfate (SDS) at 180°C for 12 h.
Abstract: SnS2 nanoparticles have been synthesized using a mild hydrothermal method in the presence of the surfactant sodium dodecyl sulfate (SDS) at 180 °C for 12 h. Physical investigations were carried out to study their structure, size, morphology and optical properties. The x-ray diffraction (XRD) pattern of the as-prepared sample is indexed to the hexagonal phase of SnS2 and the particle size is 100 nm, which is further confirmed by transmission electron microscopy (TEM). The UV-visible spectrum shows that the absorption edge is blue shifted, and the band gap of the prepared SnS2 nanoparticles has been evaluated with UV-visible spectroscopy to be 3.54 eV, which is larger than the bulk SnS2 (~2.44 eV). The anionic surfactant SDS plays a key role in the formation of the 3D sphere like SnS2 nanostructures. A probable reaction for the formation of nanocrystalline SnS2 nanoparticles is proposed.

27 citations

Journal ArticleDOI
TL;DR: In this paper, pure and europium doped cerium dioxide (CeO2) nanoparticles were synthesized for the first time via glycine-assisted hydrothermal process and comparatively investigated their structural, optical, photoluminescence, photocatalytic and antibacterial properties.

23 citations


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01 Dec 1991
TL;DR: In this article, self-assembly is defined as the spontaneous association of molecules under equilibrium conditions into stable, structurally well-defined aggregates joined by noncovalent bonds.
Abstract: Molecular self-assembly is the spontaneous association of molecules under equilibrium conditions into stable, structurally well-defined aggregates joined by noncovalent bonds. Molecular self-assembly is ubiquitous in biological systems and underlies the formation of a wide variety of complex biological structures. Understanding self-assembly and the associated noncovalent interactions that connect complementary interacting molecular surfaces in biological aggregates is a central concern in structural biochemistry. Self-assembly is also emerging as a new strategy in chemical synthesis, with the potential of generating nonbiological structures with dimensions of 1 to 10(2) nanometers (with molecular weights of 10(4) to 10(10) daltons). Structures in the upper part of this range of sizes are presently inaccessible through chemical synthesis, and the ability to prepare them would open a route to structures comparable in size (and perhaps complementary in function) to those that can be prepared by microlithography and other techniques of microfabrication.

2,591 citations

Journal ArticleDOI
TL;DR: In this article, the key factors which may affect the photocatalytic and antibacterial properties of ZnO based on the working mechanisms are discussed and the methods that can be used to improve the performance of the material.

205 citations

Journal ArticleDOI
TL;DR: In this article, an Ag-doped counter electrode for dye-sensitized solar cells (DSSCs) is proposed, which shows an impressive photovoltaic conversion efficiency of 8.70% which exceeds the efficiency of a Pt-based DSSC (7.88%) by 10.41%.
Abstract: Tin disulfide (SnS2) has been considered as a prospective counter electrode (CE) material for dye-sensitized solar cells due to its good electrocatalytic properties. However, its low electronic and ionic conductivities pose challenges for using it in high-performance dye-sensitized solar cells (DSSCs). Herein, doping is utilized to improve the properties of SnS2 for application as a DSSC counter electrode. Ag-doped SnS2 samples with various doping amounts are prepared via a facile one-step solvothermal route. It is found that the DSSC based on a 5% Ag-doped SnS2 CE demonstrates the best performance showing an impressive photovoltaic conversion efficiency (PCE) of 8.70% which exceeds the efficiency of a Pt-based DSSC (7.88%) by 10.41%, while the DSSC consisting of undoped SnS2 only exhibits a PCE of 6.47%. Such an enhanced efficiency of the DSSC is attributed to the effectively improved electrocatalytic activity and mixed conductivity resulting from the Ag dopant. Therefore, the Ag-doped SnS2 CE proves to be a promising alternative to the expensive Pt CE in DSSCs and may pave a new way for large-scale production of new-generation DSSCs.

103 citations

Journal ArticleDOI
TL;DR: In this paper, a homogeneous precipitation method was used to synthesize ZnO, NiO nanoparticles and ZnNO-NiO nanocomposites with and without surfactants, sodium dodecyl sulphate (SDS) and hexamethylenetetramine (HMT) to alter the composition of nanocomposition.

102 citations

Journal ArticleDOI
TL;DR: In this article, the authors reported the synthesis of CuS nanoparticles with distinguishable surface plasmonic resonance (SPR) peaks in near infrared region, which is a characteristic SPR peak for CuS nano-composite.
Abstract: In this article we report the synthesis of CuS nanoparticle with distinguishable surface plasmonic resonance (SPR) peaks in near infrared region. For this purpose in situ synthesis (one-step fabrication) has been used to prepare CuS nanoparticles in PMMA polymer matrix at room temperature. The X-ray diffraction spectrum confirms the formation of CuS nanoparticles. The transmittance spectra of nano-composite samples reveal that the samples have a good transparency. The absorption spectra show a broad absorption peak in the wavelength region from 570 to 980 nm which is a characteristic SPR peak for CuS nanoparticle. An increase of refractive index was observed for the samples containing CuS nanoparticles. The linear relationship between the refractive index and volume fraction was observed. The appearance of SPR peak in refractive index spectra was attributed to CuS nanoparticles. Shifting of absorption edge to lower photon energy has been observed for nano-composite samples. The direct energy bandgap of nano-composite samples are reduced compare to pure PMMA polymer. The plot between the direct energy band gap and refractive index reveals that the decrease in bandgap energy is associated with the increase in index of refraction. The increase of optical dielectric constant can be ascribed to the formation of CuS nanoparticles. The low band gap of CuS nanoparticles in the present work reveals their importance for applications in optoelectronic devices.

83 citations