Pressure induced photoluminescence modulation in a wide range and synthesis of monodispersed ternary AgCuS nanocrystal based on Ag2S nanocrystals†,Nanoscale

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Pressure induced photoluminescence modulation in a wide range and synthesis of monodispersed ternary AgCuS nanocrystal based on Ag2S nanocrystals†
Nanoscale ( IF 5.8 ) Pub Date : 2018-01-02 00:00:00 , DOI: 10.1039/c7nr08369f
Yingnan Wang _{1,

2,

3,

4} , Xiaoteng Li _{4,

5,

6,

7,

8} , Manzhang Xu _{1,

2,

3,

4} , Kai Wang _{4,

9,

10,

11} , Hongyang Zhu _{12,

13,

14,

15} , Wu Zhao _{1,

2,

3,

4} , Junfeng Yan _{1,

2,

3,

4} , Zhiyong Zhang _{1,

2,

3,

4}

Affiliation

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 can only be modulated below ∼1200 nm with increasing particle size. Meanwhile, ternary silver copper chalcogenides (AgCuX, X = S, Se) have also attracted increased attention in recent years. Temperature-dependent structural phase transformation leads electrical transport to exhibit fascinating transitions 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 is mainly through melting the mixture of Ag, Cu and S/Se powder under extremely high reaction temperatures (973–1373 K) and long reaction time, forming a bulk product. Therefore, the synthesis of high quality monodispersed and size-tunable AgCuS or AgCuSe NCs is still a challenge. To address these issues, in this paper, we report using Ag₂S NCs as a template, a method to synthesize monodispersed and size-tunable β-AgCuS NCs via ion exchange and diffusion processes. Similarly, monodispersed β-AgCuSe NCs were also synthesized by this simple and reproducible strategy. This synthetic method opens new avenues for investigating the size-, morphology- and temperature-dependent phase transitions of these ternary AgCuS and AgCuSe materials. Thus, the 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 using in situ high pressure PL and absorption spectroscopy. We found that the PL peak of 6.0 nm for Ag₂S NCs could be easily adjusted from ∼1200 to 1900 nm with increasing pressure from 0 to 5.1 GPa, which greatly extends the wavelength range of the PL peak beyond that of other approaches.

中文翻译：

压力诱导的大范围光致发光调制和基于Ag ₂ S纳米晶体的单分散三元AgCuS纳米晶体的合成†

二元Ag ₂ S纳米晶体（NCs）具有低毒性，窄的直接带隙和高发射效率的近红外光致发光（PL），具有许多潜在的光学应用。然而，由于其激子玻尔半径小（2.2 nm），Ag ₂的PL光谱随着粒径的增加，只能将S NCs调制在〜1200 nm以下。同时，近年来，三元银铜硫属元素化物（AgCuX，X = S，Se）也引起了越来越多的关注。与温度有关的结构相变导致电传输在p型和n型导电之间表现出令人着迷的过渡，这使AgCuS和AgCuSe成为二极管或晶体管器件的理想材料。尽管如此，合成这些材料的传统方法主要是通过在极高的反应温度（973–1373 K）和较长的反应时间下熔化银，铜和S / Se粉末的混合物，形成块状产品。因此，合成高质量的单分散和尺寸可调的AgCuS或AgCuSe NCs仍然是一个挑战。为了解决这些问题，在本文中，我们报告使用Ag ₂以S NC为模板，这是一种通过离子交换和扩散过程合成单分散和尺寸可调的β-AgCuSNC的方法。同样，也可以通过这种简单且可重复的策略合成单分散的β-AgCuSeNCs。这种合成方法为研究这些三元AgCuS和AgCuSe材料的尺寸，形态和温度相关的相变开辟了新途径。因此，将来可以研究p型和n型导电之间的相应电传输。此外，我们使用原位高压PL和吸收光谱系统地研究了单分散Ag ₂ S NCs的压力依赖性PL特性和带隙调制。我们发现Ag ₂的PL峰为6.0 nm随着压力从0到5.1 GPa的增加，可以轻松地将S NCs从1200 nm调整到1900 nm，这大大扩展了PL峰的波长范围，超越了其他方法。

更新日期：2018-01-02

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