Colloidal Nanoparticles of a Metastable Copper Selenide Phase with Near-Infrared Plasmon Resonance
Colloidal Nanoparticles of a Metastable Copper Selenide Phase with Near-Infrared Plasmon Resonance
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DOI：
10.1021/acs.chemmater.0c04058
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发表时间：
2020-12
影响因子：
8.6
通讯作者：
Robert W. Lord;J. Fanghanel;Cameron F. Holder;I. Dabo;R. Schaak
中科院分区：
文献类型：
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作者：
Robert W. Lord;J. Fanghanel;Cameron F. Holder;I. Dabo;R. Schaak
硒化铜纳米颗粒是一种重要的材料，具有广泛的应用前景。另外已知硒化铜采用几种不同的晶体结构和组成。在这里，我们报告的胶体Cu 2-xSe纳米粒子，采用不同于其他已知的硒化铜相的结构的直接溶液相合成。该Cu 2-xSe相被确定为在结构上与魏氏体Cu 2-xTe相关，魏氏体Cu 2-xTe是包含交替的富Cu层和贫Cu层的层状化合物，其包含硫族元素原子的扭曲的六方层。当在溶液中退火的weissite样的Cu 2-xSe纳米粒子，它们转化为更稳定的立方berzelianite相，表明它们是亚稳态的。类黄长石Cu 2-xSe纳米颗粒的光学表征显示出以1550 nm左右为中心的宽等离子体吸收带，并且当受到还原和氧化条件时，该吸收带的位置仅略有移动。
Copper selenide nanoparticles are important materials with desirable properties for a broad scope of applications. Copper selenides are additionally known to adopt several different crystal structures and compositions. Here, we report the direct solution-phase synthesis of colloidal Cu2–xSe nanoparticles that adopt a structure distinct from other known copper selenide phases. This Cu2–xSe phase was determined to be structurally related to weissite Cu2–xTe, which is a layered compound containing alternating Cu-rich and Cu-deficient layers sandwiching distorted hexagonal layers of chalcogen atoms. When the weissite-like Cu2–xSe nanoparticles were annealed in solution, they converted to the more stable cubic berzelianite phase, indicating that they are metastable. Optical characterization of the weissite-like Cu2–xSe nanoparticles showed a broad plasmon absorption band centered around 1550 nm, and the position of this absorption band shifted only slightly when subjected to reductive and oxidative conditions.