Growth of Photocatalytic CdSe–Pt Nanorods and Nanonets

Abstract

Hybrid nanocrystals, colloidal structures that combine dissimilar material systems into a single particle, have been studied with great interest over the past few years. Different material combinations within hybrid nanocrystal systems have been recently demonstrated including metal-semiconductor, [1][2][3][4][5][6][7][8][9] metal-magnet, [8,[10][11][12][13] and magnet-semiconductor. [7,8,[14][15][16] In metal-semiconductor hybrid nanoparticles the metal domains may serve as preferential anchoring sites for attaching molecules to direct the assembly of different structures [17] and for electrical connection. Photocatalytic processes are also of interest in metal-semiconductor systems. [18][19][20][21][22][23] Following light absorption and the formation of an exciton in the semiconductor region, rapid charge separation can take place at the metal/semiconductor interface and the separated charge can be used to facilitate redox reactions. Most nanoscale metal-semiconductor photocatalysis systems studied so far have focused on metal oxides such as TiO 2 and ZnO, which exhibit only UV absorption and therefore poorly cover the solar spectrum. [24][25][26][27] Recently, the photoinduced growth reaction of CdS-Pt (CdS nanoparticles grown in aqueous solution) and its use in water splitting have been reported. [28,29]

Hierarchical synthesis of non-centrosymmetric hybrid nanostructures and enabled plasmon-driven photocatalysis

“…A predictive model combined with elaborative material control is necessary in order to gain an understanding of the upper limit of plasmon-mediated enhancement towards design of highly efficient photocatalysts 9 . To that, in order to evaluate and to compare the photocatalytic performance of new family of Pt-Au x Ag 1 À x -CdSe nc-HNs with existing photocatalysts in literature 41,42 , we choose a standard redox reaction of methylene blue (MB) dye molecules as a model system, in which the MB molecules can be reduced to form colourless leucomethylene molecules upon addition of two electrons ( Fig. 4a and Supplementary Fig.…”

Large scale photochemical synthesis of M@TiO2 nanocomposites (M = Ag, Pd, Au, Pt) and their optical properties, CO oxidation performance, and antibacterial effect

“…Versatile colloidal methods for the synthesis of noble metal nanoparticles have emerged recently, but require the presence of organic molecules or solvents [21][22][23]. Generally, there are two methods to prepare a composite catalyst of such noble metal nanoparticles loaded on a support.…”

Colloidal Magnetic Heterostructured Nanocrystals with Asymmetric Topologies: Seeded-Growth Synthetic Routes and Formation Mechanisms

“…Depending on the reaction medium (e.g., the presence of hole/electron scavengers) and the irradiation conditions, the metal section could either act a sink for the electrons photogenerated within the semiconductor, or help transferring them to the solution. Manipulation of these mechanisms enabled exploitation of these MHNCs as photocatalysts capable of performing efficient charge retention or affording enhanced photocatalytic reduction yields, respectively (Costi et al, , 2010Elmalem et al, 2008;Amirav and Alivisatos, 2010;Sitt et al, 2013;Banin et al, 2014;Nakibli and Amirav, 2016). The magnetic-metal domains could also be utilized to enable magnetic separation and subsequent recycling of the photocatalysts.…”