We demonstrate that Ag(2)S nanocrystals are the bifunctional mediator for controllable growth of semiconductor heterostructures including more complicated multisegments heterostructures in solution-phase, which is a new type of nanomediator and quite different from the metal nanoparticle catalyst. The intrinsic high Ag(+) ion mobility makes Ag(2)S nanocrystals not only exhibit excellent catalytic function for growth of metal sulfide heterostructures but also act as a source-host for growth of ternary semiconductor heterostructures, for example, Ag(2)S-AgInS(2). The semiconductors grow epitaxially from or inward in Ag(2)S nanocrystals forming single-crystalline heterostructures. Moreover, the method developed here also can construct multisegments heterostructures, for example, Ag(2)S-CdS-ZnS, AgInS(2)-Ag(2)S-AgInS(2). The interfacial structure is still stable even if the lattice mismatch is quite large, which is a unique feature of this method.
"and 2:0.9. Standard diffraction patterns of Ag (cubic) and Ag 2 S (monoclinic) are also shown for comparison achieved higher volume proportion of Ag in Ag/Ag 2 S HDs (Jiang et al. 2011; Pang et al. 2010; Xiong et al. 2013; Zhu and Xu 2011 "
[Show abstract][Hide abstract] ABSTRACT: Heterodimers are conjoined particles of two inorganic materials, and they are generally synthesised in multiple steps. But, the multi-step syntheses are less effective because of the low yield, long reaction time, labour intensive process and complexity in the synthesis and thus not ideal for scale up. Herein, we have demonstrated single-step, one-pot syntheses for two different types of Ag/Ag 2 S heterodimers. Two types of heterodimers were obtained while varying stoichiometry in the reaction of AgNO 3 with sulphur in the presence of hexam-ethyldisilazane (HMDS) at 140 °C. To the best of our knowledge, this was the first demonstration of single-step process to synthesise Ag/Ag 2 S heterodimers. Heterodimers had dumbbell shape with both metal and semiconductor domains in single particle which were constructed by spherical Ag and Ag 2 S nanoparticles. Ag (2 0 0) and Ag 2 S (0 2 2) planes associated to form heterodimers. The presence of metal–semiconductor interfaces was confirmed by HRTEM and UV analysis. Thus, we have demonstrated the HMDS-assisted synthesis as a promising method for direct synthesis of Ag/Ag 2 S heterodimers.
Journal of Nanoparticle Research 07/2015; 17(7):325. DOI:10.1007/s11051-015-3126-y · 2.18 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: A facile and inexpensive solution-based synthesis of quaternary AgInZn7S9nanowires was developed. Structural and compositional characterizations were carried out by transmission electron microscopy (TEM), energy-dispersive spectroscopy (EDS) analysis, and powder X-ray diffraction (XRD). The as-synthesized AgInZn7S9nanowires have high quality and moderate band structure. The growth mechanism is also investigated. It is confirmed that Ag2S nanoparticles derived from the decomposition of precursor Ag(dedc) act as a catalyst during the growth of quaternary nanowires. The catalysts in this process were found to be in a quasi-liquid state and only the surface region of the catalysts melted, which is different from the liquid state in the typical Solution–Liquid–Solid growth process.
[Show abstract][Hide abstract] ABSTRACT: Heterostructured semiconductor matchsticks with Ag2S heads and ZnS stems (see TEM image) were synthesized by thermal co-decomposition of Ag(DDTC) and Zn(DDTC)2 (DDTC=diethyldithiocarbamate). The heteronanostructures show both UV/blue (λex=280 nm) and near-infrared (λex=785 nm) photoluminescence.
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