Nano-structured phases of gallium oxide (GaOOH, α-Ga2O3, β-Ga2O3, γ-Ga2O3, δ-Ga2O3, and ε-Ga2O3): fabrication, structural, and electronic structure investigations

被引：40

作者：

Sharma, Aditya ^{[1
]}

Varshney, Mayora ^{[2
]}

Saraswat, Himani ^{[1
]}

Chaudhary, Surekha ^{[1
]}

Parkash, Jai ^{[1
]}

Shin, Hyun-Joon ^{[3
]}

Chae, Keun-Hwa ^{[4
]}

Won, Sung-Ok ^{[4
]}

机构：

[1] Manav Rachna Univ, Dept Phys, Faridabad 121004, Haryana, India

[2] Gautam Buddha Univ, Sch Vocat & Appl Sci, Dept Appl Phys, Greater Noida 201312, Uttar Pradesh, India

[3] Pohang Accelerator Lab POSTECH, Pohang 37673, Gyeongbuk, South Korea

[4] KIST, Adv Anal Ctr, Seoul 02792, South Korea

来源：

INTERNATIONAL NANO LETTERS | 2020年 / 10卷 / 01期

基金：

新加坡国家研究基金会;

关键词：

XRD; XAS; Polymorphs; Ga2O3; OPTICAL-PROPERTIES; GA2O3; FILMS; MECHANISM;

D O I：

10.1007/s40089-020-00295-w

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Regardless of much curiosity in the synthesis and diversifying properties of the polymorphs of gallium oxide, they are still unrevealed due to their nanoscale size and structural disorders. In this study, convincing methods have been applied to achieve various phases of gallium oxide (i.e., GaOOH, alpha-Ga2O3, beta-Ga2O3, gamma-Ga2O3, delta-Ga2O3, and epsilon-Ga2O3). X-ray diffraction (XRD) along with Rietveld refinement has been employed to investigate the structural parameters of barely reported phases. Transmission electron microscopy (TEM) images reveal the impact of the protocols of chemical synthesis on the morphology/size of the polymorphs of gallium oxide. Mechanistic discussion on the formation of nano-rod morphology in some of the phases (GaOOH and alpha-Ga2O3) and nano-particle morphology in other (beta-Ga2O3, gamma-Ga2O3, delta-Ga2O3 and epsilon-Ga2O3) phases is also provided by considering the experimental parameters. The existence of Ga3+ ions and their local hybridization with the oxygen is investigated using the X-ray absorption spectroscopy (XAS) at Ga K-edge and conveyed the phase dependence on the hybridization of frontier orbitals.

引用

页码：71 / 79

页数：9