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Pressure Induced Photoluminescence Modulation in a Wide Range and Synthesis of Monodispersed Ternary AgCuS Nanocrystal Based on Ag2S Nanocrystals

Abstract

Binary Ag2S nanocrystals (NCs) have many potential optical applications because of their low toxicity, narrow direct band gaps and near-infrared photoluminescence (PL) with high emission efficiency. However, due to its small exciton Bohr radius (2.2 nm), the PL spectra of Ag2S NCs could only be modulated below ~1200 nm with increasing particle size. Meanwhile, ternary silver cupper chalcogenides (AgCuX, X=S, Se) have also attracted increasing attention in recent years. Temperature dependent structure phase transformation leads electrical transport to exhibit fascinating transition between p and n type conduction, which makes AgCuS and AgCuSe ideal materials for diode or transistor devices. Nevertheless, the traditional method to synthesize these materials are mainly through melting the mixture of Ag, Cu and S/Se powder under extreme high reaction temperature (973-1373 K) and long reaction time, forming bulk product. Therefore, synthesis of high quality monodispersed and size-tunable AgCuS or AgCuSe NCs is still a challenge. Facing these issues, in this paper, using Ag2S NCs as template, monodispersed and size-tunable β-AgCuS NCs could be synthesized via ion exchange and diffusion process. Similarly, monodispersed β-AgCuSe NCs could also be synthesized by this simple and reproducible strategy. This thus opens new avenues for investigating size, morphology and temperature dependent phase transitions of these ternary AgCuS and AgCuSe materials. And then, corresponding electrical transport between p and n type conduction can be studied in the future. Furthermore, we systematically investigated the pressure-dependent PL properties and band gap modulation of monodispersed Ag2S NCs by using in situ high pressure PL and absorption spectroscopy. We found that the PL peak of 6.0 nm Ag2S NCs could be easily adjusted from ~1200 to 1900 nm with increasing pressure from 0 to 5.1 GPa, which greatly extend the wavelength range of PL peak than any other approaches.

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Publication details

The article was received on 10 Nov 2017, accepted on 31 Dec 2017 and first published on 02 Jan 2018


Article type: Paper
DOI: 10.1039/C7NR08369F
Citation: Nanoscale, 2018, Accepted Manuscript
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    Pressure Induced Photoluminescence Modulation in a Wide Range and Synthesis of Monodispersed Ternary AgCuS Nanocrystal Based on Ag2S Nanocrystals

    Y. Wang, X. Li, M. Xu, K. Wang, H. Zhu, W. Zhao, J. Yan and Z. Zhang, Nanoscale, 2018, Accepted Manuscript , DOI: 10.1039/C7NR08369F

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