Department of Chemistry

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Author: search.filters.author.Pande, SurojitSubject: search.filters.subject.Nanoparticles

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Now showing 1 - 4 of 4
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    Fabrication of Au decorated MoS2 Langmuir Blodgett film as SERS sensing scaffold for detection of thiram in aqueous solution and in carrot peels
    (Elsevier, 2024-10) Pande, Surojit
    This paper is focused on simple fabrication of robust and reproducible SERS active substrate through self-assembly of gold nanoparticles (AuNps) entrapped in the Langmuir Blodgett (LB) film of MoS2 flakes. The as prepared Au-MoS2 substrate can detect SERS signals of 4-Mercapto Pyridine (4-Mpy) molecules at trace concentrations down to 10-12 M. The substrate has been further employed in detecting thiram (TH) both in aqueous solution and in carrot peels (CPls). The limit of detection (LOD) of TH in aqueous medium and in CPls have been estimated to be ∼ 5.18 and 10.16 pM respectively. We believe that the applicability of this SERS active substrate may be extended in the trace detections of explosives, drugs and in diagnostic applications.
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    Gram Level Synthesis of Lead-Free Solder in the Nanometer Length Scale Obtained from Tin and Silver Compounds Using Silicone Oil
    (ACS, 2008-07-19) Pande, Surojit
    A straightforward route to gram level synthesis of a pure phase of the Sn−Ag nanoalloy in an eutectic composition (Sn/Ag 96.5:3.5) in silicone oil is reported. The composition, morphology, and microstructure of the alloy were fully characterized. In a mixture of ethylene glycol and silicone oil, direct reduction of Sn(II) acetate and Ag(I) nitrate gave the Sn−Ag nanoalloy. The nanoalloy disintegrates by sonication and reforms by heating, leading to smaller particles with a melting point as low as 128 °C.
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    Dendrimer-encapsulated nanoparticles: New synthetic and characterization methods and catalytic applications
    (RSC, 2011) Pande, Surojit
    In this article we describe the synthesis, characterization, and applications of dendrimer-encapsulated nanoparticles (DENs). These materials are synthesized using a template approach in which metal ions are extracted into the interior of dendrimers and then subsequently reduced chemically to yield nearly size-monodisperse particles having diameters in the 1–2 nm range. Monometallic, bimetallic (alloy and core@shell), and semiconductor nanoparticles have been prepared by this route. The dendrimer component of these composites serves not only as a template for preparing the nanoparticle replica, but also as a stabilizer for the nanoparticle. In this perspective, we report on progress in the synthesis, characterization, and applications of these materials since our last review in 2005. Significant advances in the synthesis of core@shell DENs, characterization, and applications to homogeneous and heterogeneous catalysis (including electrocatalysis) are emphasized.
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    Decoration of Pd and Pt nanoparticles on a carbon nitride (C3N4) surface for nitro-compounds reduction and hydrogen evolution reaction
    (RSC, 2017) Basu, Mrinmoyee; Gangopadhyay, Subhashis; Pande, Surojit
    Herein, we propose the synthesis of Pd and Pt monometallic nanoparticles on a carbon nitride (C3N4) surface for the reduction of nitro compounds as well as for electrocatalysis. For the synthesis of C3N4/Pd and C3N4/Pt, metal ions were initially adsorbed on the C3N4 surface and then subsequently reduced by NaBH4. The as-synthesized heterostructures were authenticated by different characterization techniques: UV-vis, PXRD, XPS, TEM, FESEM, and EDS. Decorations of monometallic NPs on C3N4 not only improved the reduction efficiency of nitro-compounds but also enhanced the electrocatalytic activity in the hydrogen evolution reaction. C3N4/Pt proved to be an efficient electrocatalyst as it requires a potential of −0.339 V to attain a current density of 10 mA cm−2; whereas, C3N4/Pd requires −0.371 V to reach a current density of 10 mA cm−2vs. Ag/AgCl. Both C3N4/Pd and Pt heterostructures are better than bare C3N4, which needs −0.596 V to achieve a current density of 10 mA cm−2vs. Ag/AgCl. On the other hand, C3N4/Pd showed a better performance in nitro-compound reduction compared to C3N4/Pt and bare C3N4. The kinetic study reveals that the rate constant using a C3N4/Pd catalyst is 6.7 × 10−1 min−1 for p-nitroaniline reduction, which is 101 times higher compared to bare C3N4 and 4.7 times higher in comparison to C3N4/Pt.