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A simple, yet novel hydrothermal method has been developed to synthesize surfactant-free Cu2ZnSnS4 nanocrystal ink in water. The environmentally friendly, 2-4 nm ultrafine particles are stable in water for several weeks. Detailed X-ray diffraction (XRD) and high-resolution transmission electron microscopy revealed the formation of(More)
Oxides of the formula Nd2Ba2CaCu2_xZnxTi3Oi4 (x = 0:0, 0.5, 1.0, 1.5, 2.0) have been successfully prepared by high temperature ceramic route at 1025 8C, as well as by the low temperature citrate precursor route at 800 8C. The copper-rich compounds obtained by the ceramic route (x = 0-1.0) are found to have a tetragonal structure, with the a and c parameters(More)
We report the growth of graphene at a low temperature using the cold wall chemical vapor deposition technique (CWCVD). Few layered (~6-8 layers) graphene were grown on nickel-coated silicon with acetylene as the precursor gas. The advantage of the combination of the acetylene (as a carbon feedstock) and the nickel catalyst was the lowering of the graphene(More)
There are substantial quantum fluctuations even in a pure coherent state. For example, the quadrature fluctuation in coherent state |α > is 1 2 and the fluctuation in photon number is |α|2. Further, randomization in the case of general classical states which are random superposition of coherent states can only increase these fluctuations. But there are some(More)
Monophasic oxides of the formula, Ba!_xPbxTiO3 (0 < x < 1:0) were obtained at temperatures close to 500 8C from polymeric precursors formed using citric acid and ethylene glycol. These oxides were found to be tetragonal for all values of x, the distortion increasing with Pb content. Differential scanning calorimetry (DSC) shows that the decomposition of the(More)
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