Thermal stability of nanoparticle size and phase composition of nanostructured Ag2S silver sulfide
Thermal stability of nanoparticle size and phase composition of nanostructured Ag2S silver sulfide
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DOI：
10.1016/j.jallcom.2018.06.351
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发表时间：
2018-10-25
影响因子：
6.2
通讯作者：
Vovkotrub, Emma G.
中科院分区：
文献类型：
--
作者：
Sadovnikov, Stanislav, I;Vovkotrub, Emma G.
用原位高温X射线衍射、扫描电镜和拉曼光谱等方法首次研究了纳米银硫化物Ag_2S粉末的相组成和粒度的热稳定性。结果表明，在氧化性环境中或在氧化性杂质的存在下，纳米结构的硫化银的加热伴随着其分解（解离），并分离出金属银。硫化银颗粒的还原导致Ag 2S分解温度的降低。通过拉曼散射证实了由于在空气中通过高功率激光辐射加热而导致的Ag 2S纳米粉末的分解和银金属的分离。在没有氧化环境的情况下，加热银硫化物直到接近450 K的温度不会导致其分解和纳米颗粒生长。纳米颗粒的尺寸增加作为在450-930 K的温度下退火的结果，对应于银硫化物纳米粉末的集体再结晶的区域。对于纳米结构的银硫化物，在450-900 K的温度范围内的集体再结晶的活化能Q类似于0.12 eV·原子（-1）。(C)2018爱思唯尔B. V.保留所有权利。
The thermal stability of phase composition and particle size of nanocrystalline silver sulfide Ag2S powder has been examined for the first time by in situ high-temperature X-ray diffraction, scanning electron microscopy and Raman spectroscopy methods. It was shown that in oxidizing environment or in the presence of oxidizing impurities, heating of nanostructured silver sulfide is accompanied by its decomposition (dissociation) with isolation of metallic silver. Reduction of silver sulfide particles leads to decreasing the decomposition temperature of Ag2S. The decomposition of Ag2S nanopowder with isolation of silver metal as a result of heating in air by high-power laser radiation was confirmed by Raman scattering. In the absence of oxidizing environment, heating of silver sulfide does not lead to its decomposition and nanoparticle growth up to the temperature of similar to 450 K. The nanoparticle size increases as a result of annealing at a temperature of 450-930 K corresponding to the region of collective recrystallization of silver sulfide nanopowder. For nanostructured silver sulfide, the activation energy Q of collective recrystallization in the temperature range 450-900 K is similar to 0.12 eV.atom(-1). (C) 2018 Elsevier B.V. All rights reserved.