Enhancing photoluminescence properties of SiC/SiO2 coaxial nanocables by making oxygen vacancies

被引：33

作者：

Liu, Wenna ^{[1
]}

Chen, Junhong ^{[2
]}

Yang, Tao ^{[1
]}

Chou, Kuo-Chih ^{[1
]}

Hou, Xinmei ^{[1
]}

机构：

[1] Univ Sci & Technol Beijing, State Key Lab Adv Met, Beijing 100083, Peoples R China

[2] Univ Sci & Technol Beijing, Sch Mat Engn, Beijing 100083, Peoples R China

来源：

DALTON TRANSACTIONS | 2016年 / 45卷 / 34期

基金：

中国国家自然科学基金;

关键词：

SIC NANOWIRES; NANOCHAIN HETEROJUNCTIONS; CORE-SHELL; FABRICATION; NANOCRYSTALS; COMPOSITES;

D O I：

10.1039/c6dt02049f

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Coaxial nanocables (CNs) with an SiC core and a SiO2 shell were fabricated at a large scale by a simple and low cost method. The thickness of the SiO2 shell could be controlled by etching in 1 M NaOH aqueous solution for different amounts of time. XRD, SEM, TEM, HRTEM, PL and UV-Vis spectra were adopted to investigate the morphology and optical properties of the obtained SiC/SiO(2)CNs. Blue photoluminescence was observed at room temperature from the coaxial structure. The intensity of the single emission band at 468 nm (2.65 eV) exhibited a strong dependence on the thickness of the SiO2 layer and was significantly enhanced when the outer SiO2 shell had a thickness of 2.8 nm. The enhancement effect was attributed to oxygen vacancies (OV) and this was verified by deliberately enriching the surface OV through hydrogen treatment.

引用

页码：13503 / 13508

页数：6

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