Synthesis of wurtzite CuInS2 nanowires by Ag2S-catalyzed growth

Abstract

We have demonstrated that wurtzite CuInS 2 nanowires could be synthesized in solution via Ag 2 Scatalyzed growth. It is confirmed that Ag 2 S nanocrystals are formed firstly and act as catalysts for the growth of the CuInS 2 nanowires by monitoring the structures and morphologies of the Ag 2 S nanocrystals and CuInS 2 nanowires during the growth. It is believed that the high mobility of Ag + promotes the generation of Ag + vacancies in Ag 2 S, facilitating the diffusion of Cu and In species from solution into Ag 2 S to reach supersaturated states. The primary investigation of the optoelectronic property indicates that assynthesized wurtzite CuInS 2 nanowires have enhanced photoresponsivity. Furthermore, this facile method could open a new way to synthesize other various nano-structured ternary and quaternary semiconductors, such as CuIn x Ga 12x Se 2 , for applications in solar cells and other fields.

CuInS2/ZnS nanocrystals as sensitisers for NiO photocathodes

“…Figure 3b shows narrow Cu 2p doublets at Cu 2p 3/2 (932.7 eV) and Cu 2p 1/2 (952.6 eV) with a peak separation of 19.9 eV. The results are consistent with Cu(I) species in a sulphide environment, in agreement with previous reports [41][42][43] . Furthermore, the Cu 2p spectra showed no evidence of Cu(II) species on the surface of the CuInS 2 /ZnS NCs.…”

Facile one-pot synthesis of polytypic CuGaS2 nanoplates

“…The two peaks centered at 1,117 and 1,144 eV, with a peak separation of 27 eV, are attributed to trivalent Ga [20]. The two peaks of S 2 p were located at 162.4 and 163.6 eV, with a peak splitting of 1.2 eV, which are consistent with the literature values in metal sulfides [24]. Through quantification of peaks, the molar ratio of Cu/Ga/S of 1.22:1:1.93 is given, indicating that the as-synthesized nanoplates are Cu-rich with respect to the stoichiometric CGS.…”

The synthesis of hollow CuInS2 microspheres with hierarchical structures

“…Thus, there are two possible migration ways to provide copper components for the catalytic growth of CuInS 2 nanobelts, surface migration for oxidized copper or transformed Cu 2 S microspheres and solution migration for solid nanoparticles capped by DDT. The Ag 2 S nanocrystals show higher catalytic activity than that of Cu 2 S during the catalytic growth of one-dimensional nanomaterials, as demonstrated by the higher ionic conductivity [38,39]. If the copper source moved through the surface of microspheres, the CuInS 2 nanobelts catalyzed by Ag 2 S would be bound against the microspheres.…”