通过简单熔盐法合成尺寸均匀的金红石型二氧化钛微棒及其光致发光活性

Synthesis of Uniform Size Rutile TiO Microrods by Simple Molten-Salt Method and Its Photoluminescence Activity.

作者信息

Ngo Hieu Minh, Pawar Amol Uttam, Tang Jun, Zhuo Zhongbiao, Lee Don Keun, Ok Kang Min, Kang Young Soo

机构信息

Department of Chemistry, Sogang University, Seoul 04107, Korea.

Environmental and Climate Technology, Korea Institute of Energy Technology, Naju-si 58219, Korea.

出版信息

Nanomaterials (Basel). 2022 Jul 29;12(15):2626. doi: 10.3390/nano12152626.

DOI:10.3390/nano12152626

PMID:35957057

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9370513/

Abstract

Uniform-size rutile TiO microrods were synthesized by simple molten-salt method with sodium chloride as reacting medium and different kinds of sodium phosphate salts as growth control additives to control the one-dimensional (1-D) crystal growth of particles. The effect of rutile and anatase ratios as a precursor was monitored for rod growth formation. Apart from uniform rod growth study, optical properties of rutile microrods were observed by UV-visible and photoluminescence (PL) spectroscopy. TiO materials with anatase and rutile phase show PL emission due to self-trapped exciton. It has been observed that synthesized rutile TiO rods show various PL emission peaks in the range of 400 to 900 nm for 355 nm excitation wavelengths. All PL emission appeared due to the oxygen vacancy present inside rutile TiO rods. The observed PL near the IR range (785 and 825 nm) was due to the formation of a self-trapped hole near to the surface of (110) which is the preferred orientation plane of synthesized rutile TiO microrods.

摘要

采用简单的熔盐法，以氯化钠为反应介质，不同种类的磷酸钠盐为生长控制添加剂，合成了尺寸均匀的金红石型TiO微棒，以控制颗粒的一维（1-D）晶体生长。监测了作为前驱体的金红石相和锐钛矿相比例对棒状生长形成的影响。除了均匀棒状生长研究外，还通过紫外-可见光谱和光致发光（PL）光谱观察了金红石型微棒的光学性质。具有锐钛矿相和金红石相的TiO材料由于自陷激子而显示出PL发射。据观察，对于355 nm激发波长，合成的金红石型TiO棒在400至900 nm范围内显示出各种PL发射峰。所有PL发射均归因于金红石型TiO棒内部存在的氧空位。在红外范围（785和825 nm）附近观察到的PL是由于在（110）表面附近形成了自陷空穴，（110）是合成的金红石型TiO微棒的择优取向平面。