ОПТИЧНI ВЛАСТИВОСТI НАНОЧАСТИНОК СУЛЬФIДУ КАДМIЮ У СТАБIЛIЗУЮЧИХ РОЗЧИНАХ
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Дата
2004
Науковий керівник
Укладач
Редактор
Назва журналу
Номер ISSN
Номер E-ISSN
Назва тому
Видавець
Анотація
Одержано нанокристали сульфiду кадмiю, синтезованi у прозорих дiелектричних матри-
цях.Експериментально дослiджено умови хімiчного синтезу нанокристалiв у розчинах рiзних дiелектричних середовищ.При температурах 300 K i 90 K вивчено спектри пропускання та поглинання наночастинок, оцiнено їхнi спектральнi та напiвпровiдниковi характеристики (ши-
рину забороненоЁ зони,зсув краю поглинання, радiус наночастинок). Установлено, що дослi-
дженi структури характеризуються квантово-розмiрними ефектами,а розмiр наночастинок
сутт№во залежить вiд технологiчних умов одержання.
This paper presents the results of an experimental research of optical properties of A2B6 nanocrystal compounds dispersed in polimeric matrices.Some attention was paid to a change of optical spectrum caused by the transition from bulk samples to nanocrystals. The object of the research was a polymeric film of cadmium sulphide (CdS).Nanoparticles of CdS where acquired through the chemical reaction of water solutions of cadmium nitrate and natrium sulphide.The received suspension was entered into a water solution a polymer-stabilizer (gelatine, polyvinyl alcohol).The colloidal solutions were rendered on glass and quartz substrates. The measurements of a spectral dependence of transmission and absorbtion of samples were carried on the spectrophotometer at the temperatures of 90 and 300 K.The transmission specta of a stabilizer and bulk monocrystals of CdS were measured for comparison with nanocrystals.The experiment has shown that in the spectrum of absorption of samples containing CdS nanocrystals the edge of band is displaced in the short-wave region in comparison with the edge of band of a cadmium sulphide monocrystal.This implies that a nanocrystal cadmium sulphide embedded into a dielectric matrix is inherent to quantum dimensional effects.The physical parameters of CdS nanocrystals were measured and calculated by optical methods. The dependence of the size of cadmium sulphide nanoparticles on the technology preparing patterns was shown.
This paper presents the results of an experimental research of optical properties of A2B6 nanocrystal compounds dispersed in polimeric matrices.Some attention was paid to a change of optical spectrum caused by the transition from bulk samples to nanocrystals. The object of the research was a polymeric film of cadmium sulphide (CdS).Nanoparticles of CdS where acquired through the chemical reaction of water solutions of cadmium nitrate and natrium sulphide.The received suspension was entered into a water solution a polymer-stabilizer (gelatine, polyvinyl alcohol).The colloidal solutions were rendered on glass and quartz substrates. The measurements of a spectral dependence of transmission and absorbtion of samples were carried on the spectrophotometer at the temperatures of 90 and 300 K.The transmission specta of a stabilizer and bulk monocrystals of CdS were measured for comparison with nanocrystals.The experiment has shown that in the spectrum of absorption of samples containing CdS nanocrystals the edge of band is displaced in the short-wave region in comparison with the edge of band of a cadmium sulphide monocrystal.This implies that a nanocrystal cadmium sulphide embedded into a dielectric matrix is inherent to quantum dimensional effects.The physical parameters of CdS nanocrystals were measured and calculated by optical methods. The dependence of the size of cadmium sulphide nanoparticles on the technology preparing patterns was shown.
Опис
Журнал фiзичних дослiджень = Journal of Physical Studies. - Львiв : Б.в.
Ключові слова
кристали, наночастинки, синтез, стабiлiзатор, спектри, поглинання
Бібліографічний опис
Журнал фiзичних дослiджень = Journal of Physical Studies