硫醇包覆的Ag-Zn-Sn-S纳米晶体水溶液的拉曼光谱和X射线光电子能谱研究
Raman and X-ray Photoelectron Spectroscopic Study of Aqueous Thiol-Capped Ag-Zn-Sn-S Nanocrystals.
作者信息
Dzhagan Volodymyr, Selyshchev Oleksandr, Havryliuk Yevhenii, Mazur Nazar, Raievska Oleksandra, Stroyuk Oleksandr, Kondratenko Serhiy, Litvinchuk Alexander P, Valakh Mykhailo Ya, Zahn Dietrich R T
机构信息
V. Lashkaryov Institute of Semiconductors Physics, National Academy of Sciences of Ukraine, 03038 Kyiv, Ukraine.
Physics Department, Taras Shevchenko National University of Kyiv, 60 Volodymyrs'ka str., 01601 Kyiv, Ukraine.
出版信息
Materials (Basel). 2021 Jun 27;14(13):3593. doi: 10.3390/ma14133593.
The synthesis of (Cu,Ag)-Zn-Sn-S (CAZTS) and Ag-Zn-Sn-S (AZTS) nanocrystals (NCs) by means of "green" chemistry in aqueous solution and their detailed characterization by Raman spectroscopy and several complementary techniques are reported. Through a systematic variation of the nominal composition and quantification of the constituent elements in CAZTS and AZTS NCs by X-ray photoemission spectroscopy (XPS), we identified the vibrational Raman and IR fingerprints of both the main AZTS phase and secondary phases of Ag-Zn-S and Ag-Sn-S compounds. The formation of the secondary phases of Ag-S and Ag-Zn-S cannot be avoided entirely for this type of synthesis. The Ag-Zn-S phase, having its bandgap in near infrared range, is the reason for the non-monotonous dependence of the absorption edge of CAZTS NCs on the Ag content, with a trend to redshift even below the bandgaps of bulk AZTS and CZTS. The work function, electron affinity, and ionization potential of the AZTS NCs are derived using photoelectron spectroscopy measurements.
报道了通过水溶液中的“绿色”化学合成（铜，银）-锌-锡-硫（CAZTS）和银-锌-锡-硫（AZTS）纳米晶体（NCs），并通过拉曼光谱和几种互补技术对其进行详细表征。通过X射线光电子能谱（XPS）系统地改变CAZTS和AZTS NCs中名义组成并对其组成元素进行定量分析，我们确定了主要AZTS相以及Ag-Zn-S和Ag-Sn-S化合物第二相的振动拉曼和红外指纹。对于这种类型的合成，无法完全避免Ag-S和Ag-Zn-S第二相的形成。其带隙在近红外范围内的Ag-Zn-S相，是CAZTS NCs吸收边对Ag含量呈现非单调依赖性的原因，甚至在低于块状AZTS和CZTS的带隙时也有红移趋势。利用光电子能谱测量得出了AZTS NCs的功函数、电子亲和势和电离势。
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