Optical properties of Ag2S quantum dots

被引：9
|
作者：
Sadovnikov, Stanislav I. [1 ,3 ]
Ishchenko, Aleksey V. [2 ]
Weinstein, Ilya A. [2 ]
机构：
[1] Russian Acad Sci, Inst Solid State Chem, Ural Branch, Ekaterinburg 620990, Russia
[2] Ural Fed Univ, NANOTECH Ctr, Ekaterinburg 620002, Russia
[3] Russian Acad Sci, Inst Solid State Chem, Ekaterinburg 620990, Russia
来源：
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS | 2023年 / 296卷
基金：
俄罗斯科学基金会;
关键词：
Colloidal Ag2S solutions; Size and zeta-potential of Ag2S quantum dots; Films of Ag2S; Matrix of polyvinyl alcohol; Optical absorption; Band gap; SILVER SULFIDE; ELECTRONIC-STRUCTURE; THERMAL-EXPANSION; THIN-FILMS; NANOCRYSTALLINE; NANOPARTICLES; NONSTOICHIOMETRY; ADSORPTION; SIZE;
D O I：
10.1016/j.mseb.2023.116667
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Colloidal solutions of silver sulfide quantum dots of various sizes were synthesized from low-concentration water solutions of silver nitrate, sodium sulfide and sodium citrate as stabilizer. The size of Ag2S quantum dots in colloidal solutions was determined by dynamic light scattering. The produced Ag2S quantum dots were dispersed in a polyvinyl alcohol (PVA) film matrix. The transmission and absorption spectra of PVA films containing Ag2S were measured in the wavelength interval 190-900 nm. A comparative study of the optical properties of PVA films with Ag2S quantum dots showed that a decrease of quantum dots to similar to 6 nm leads to an increase in the band gap Eg of silver sulfide to similar to 1.6 eV, which is almost twice larger than the band gap of bulk Ag2S. The optical properties of PVA films with Ag2S quantum dots smaller than 5 nm exhibit specific features associated with exciton transitions.
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页数：9
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