<span style="font-size:11.0pt;font-family: "Times New Roman";mso-fareast-font-family:"Times New Roman";mso-bidi-font-family: Mangal;mso-ansi-language:EN-US;mso-fareast-language:EN-US;mso-bidi-language: HI" lang="EN-US">On the <span style="font-size:11.0pt;font-family:"Times New Roman"; mso-fareast-font-family:"Times New Roman";mso-bidi-font-family:Mangal; mso-ansi-language:EN-GB;mso-fareast-language:EN-US;mso-bidi-language:HI" lang="EN-GB">structural, morphological and gas sensing properties of nanocrystalline SnO₂</span></span>

1092-1097Tin salt precursor capped by oleic acid under solvothermal conditions gives tetragonal rutile phase of SnO2 with average particle size of 14 nm with a band gap of 4.27 eV. The SnO2 nanoparticles exhibit photoluminescence with an intense purple emission band at 425 nm. The transmission electron micrographs show the growth of nanoparticles in specific orientation. The petroleum gas sensing response of this material decreases with increase of sensing temperature. </span

Hydrothermal synthesis and LPG sensing ability of SnS nanomaterial

155-160<span style="mso-fareast-font-family:Calibri; mso-ansi-language:EN-US;mso-bidi-language:AR-SA" lang="EN-US">The preparation of nanoparticles of tin sulfide is reported employing the hydrothermal method. The X-ray diffraction results of tin sulfide nanopowder confirm its orthorhombic crystalline structure. Transmission electron micrographs show that the as-prepared SnS nanoparticles are spherical in shape with the average size of 3-5 nm. Control over the particle size and size distribution have been achieved by optimizing the experimental parameters such as precursor concentration, water concentration, reaction time and temperature. <span style="mso-fareast-font-family: Calibri;color:black;mso-ansi-language:EN-IN;mso-bidi-language:AR-SA">The scanning electron micrographs suggest the presence of spherical aggregates of smaller as well as larger sizes. <span style="mso-fareast-font-family: Calibri;mso-ansi-language:EN-IN;mso-bidi-language:AR-SA">Thermal stability of these nanoparticles is investigated by thermogravimetric analysis and differential scanning calorimetry.<span style="mso-fareast-font-family: Calibri;mso-ansi-language:EN-US;mso-bidi-language:AR-SA"> <span style="mso-fareast-font-family:GulliverRM;color:black;mso-ansi-language:EN-IN; mso-bidi-language:AR-SA">The prepared nanomaterial shows good gas sensing response for liquefied petroleum gas at low operating temperatures. The high crystallinity and control over the particle size make the as-synthesized SnS an ideal candidate for LPG sensing.<span style="mso-fareast-font-family: Calibri;mso-ansi-language:EN-US;mso-bidi-language:AR-SA" lang="EN-US"> </span

Investigation on one-pot hydrothermal synthesis, structural and optical properties of ZnS quantum dots

The advantage of hydrothermal synthesis of semiconductor quantum dots (QDs) over the control of particles size, morphology and stability is reported here. In a typical synthesis procedure, the zinc and sulfur precursor molar ratio of 1:3 was used in an aqueous solution at 150 degrees C. The cubic phase of ZnS with average particles size of 5 nm was confirmed and estimated from the X-ray diffraction (XRD) analysis. The composition and purity of the sample were analyzed from (energy dispersive-ray analysis) EDAX and (X-ray photoelectron spectroscopy analysis) XPS spectra. The absorption spectrum shows the large shift in the absorption band over 90 nm due to the quantum confinement of carriers. The emission spectrum of quantum dots carry more evidence on the presence of shallow trap, deep trap in the band gap of the material responsible for weak emission in the spectral region of 450-500 nm. High resolution transmission electron microscope and scanning electron microscope studies reveal the structural and morphological features of ZnS with slightly distorted spherical morphology. We found that the coordinating ability of solvent strongly influences the reaction process and morphology of the products