Department Of Chemistry

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Author: search.filters.author.Haldar, Krishan KantHas files: Yes

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    Au/CdSe hybrid nanoflowers: a high photocurrent generating photoelectrochemical cells
    (Springer, 2019) Haldar, Krishan Kant; Biswas, R; Patra, A; Halder, K.K; Sen, T.
    Photoelectrochemical cell composed of solution-processed nanoflower heterostructure of Au core and eight CdSe petals was investigated for enhanced photocurrent generation. The electrode of CdSe nanorods displayed photocurrent density of 2.1 mA/cm 2 whereas the Au core CdSe nanoflower exhibited 4.6 mA/cm 2 corresponding to a 119% increase during photoelectrochemical cell performance. Both electrodes showed prompt response to the on/off cycles of light, the photocurrent gain (I Photon /I dark ) in CdSe nanorods is 124.7, while the value is 223.3 for Au/CdSe nanoflower, calculated from the growth-decay curves. Photoresponse time was dramatically improved for Au/CdSe nanoflower samples due to increasing in 66% incident photon-to-current emission. Electron lifetime of 21.63 and 48.71 ns was observed for the electrode of CdSe nanorods and Au/CdSe nanoflowers respectively. The prolonged electron lifetime in the case of the electrode of Au/CdSe nanoflowers was responsible for improving charge separation and as a consequence, higher photocurrent generation. © 2018, Springer Nature Switzerland AG.
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    Zn(II) Di-isobutyldithiocarbamate Complex Enabled Efficient Synthesis of Au/ZnS Nanocomposite Core-shell in One Pot
    (Wiley, 2019) Biswas, R; Singh, H; Banerjee, B; Haldar, Krishan Kant
    Here, we demonstrate a one pot synthesis of gold/zinc sulphide (Au/ZnS) core-shell type composite nanostructure via thermal decomposition of single molecular precursor Zn(II)di-isobutyldithiocarbamate complex. In these Au/ZnS core-shell type hybrid nanostructures where ZnS quantum dots are assembled onto Au nanoparticles surface were prepared via a facile and reproducible approach under mild conditions. The crystalline nature and interface of these Au/ZnS core-shell type composite nanostructures were confirmed by X-ray powder diffraction (XRD), X-ray photoelectron spectroscopy (XPS), High-resolution transmission electron microscopy (HRTEM) and inverted TEM images. Here Zn(II)di-isobutyldithiocarbamate complex acts as ZnS source as well as reducing and stabilizing agent for Au 0 at their nanoscale range by coating in the reaction medium. © 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim