Bandgap tuning and XPS study of SnO2 quantum dots

被引：118

作者：

Babu, Bathula ^{[1
]}

Reddy, I. Neelakanta ^{[1
]}

Yoo, Kisoo ^{[1
]}

Kim, Dongseob ^{[2
]}

Shim, Jaesool ^{[1
]}

机构：

[1] Yeungnam Univ, Sch Mech Engn, Gyongsan 712749, South Korea

[2] Avion Components & Syst Technol Ctr, Yeongcheon Si 38822, Gyeongsangbuk D, South Korea

来源：

MATERIALS LETTERS | 2018年 / 221卷

基金：

新加坡国家研究基金会;

关键词：

Annealing effect; SnO2; Quantum dots; Optical properties; Band-edge shift; PHOTOCATALYTIC ACTIVITY;

D O I：

10.1016/j.matlet.2018.03.107

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In this study, we investigated the influence of annealing temperature on ultra-small SnO2 quantum dots (SQDs) prepared by a simple chemical reduction process. The structural and optical properties of annealed SQDs were systematically studied by different techniques. Our results show that the crystallinity and average crystallite size of annealed SQDs increased gradually with annealing temperature. The average crystallite size was maintained below 10 nm even for high annealing temperatures. XPS peak fitting analysis yielded information on the presence of mixed ionic states of Sn2+ and Sn4+ in SQDs and further revealed that the number of Sn2+ ions decreased at high temperature. Band-edge shifts were estimated from XPS data. It was possible to shift the bandgap of annealed SQDs from UV to the visible wavelength region, which is likely to have a beneficial impact on many applications of optoelectronic devices. (C) 2018 Elsevier B.V. All rights reserved.

引用

页码：211 / 215

页数：5

共 16 条

[1] One pot synthesis of Ag-SnO2 quantum dots for highly enhanced sunlight-driven photocatalytic activity [J].

Babu, B. ;

Cho, Migyung ;

Byon, Chan ;

Shim, Jaesool .

JOURNAL OF ALLOYS AND COMPOUNDS, 2018, 731 :162-171

[2] Sunlight-driven photocatalytic activity of SnO2 QDs-g-C3N4 nanolayers [J].

Babu, B. ;

Cho, Migyung ;

Byon, Chan ;

Shim, Jaesool .

MATERIALS LETTERS, 2018, 212 :327-331

[3] Facile synthesis of SnO2 quantum dots and its photocatalytic activity in the degradation of eosin Y dye: A green approach [J].

Bhattacharjee, Archita ;

Ahmaruzzaman, M. .

MATERIALS LETTERS, 2015, 139 :418-421

[4] The role of surface and deep-level defects on the emission of tin oxide quantum dots [J].

Kumar, Vinod ;

Kumar, Vijay ;

Som, S. ;

Neethling, J. H. ;

Olivier, Ezra ;

Ntwaeaborwa, O. M. ;

Swart, H. C. .

NANOTECHNOLOGY, 2014, 25 (13)

[5] Iodinated SnO2 Quantum Dots: A Facile and Efficient Approach To Increase Solar Absorption for Visible-Light Photocatalysis [J].

Li, Pu ;

Lan, Yong ;

Zhang, Qian ;

Zhao, Ziyan ;

Pullerits, Tonu ;

Zheng, Kaibo ;

Zhou, Ying .

JOURNAL OF PHYSICAL CHEMISTRY C, 2016, 120 (17) :9253-9262

[6] Heterojunction Photocatalysts [J].

Low, Jingxiang ;

Yu, Jiaguo ;

Jaroniec, Mietek ;

Wageh, Swelm ;

Al-Ghamdi, Ahmed A. .

ADVANCED MATERIALS, 2017, 29 (20)

[7] ZnO tetrapod materials for functional applications [J].

Mishra, Yogendra Kumar ;

Adelung, Rainer .

MATERIALS TODAY, 2018, 21 (06) :631-651

[8] Effect of reducing atmosphere on the magnetism of Zn1-xCoxO (0 ≤ x ≤ 0.10) nanoparticles [J].

Naeem, M. ;

Hasanain, S. K. ;

Kobayashi, M. ;

Ishida, Y. ;

Fujimori, A. ;

Buzby, Scott ;

Shah, S. Ismat .

NANOTECHNOLOGY, 2006, 17 (10) :2675-2680

[9] Three-Dimensional SnO2 Nanowire Networks for Multifunctional Applications: From High-Temperature Stretchable Ceramics to Ultraresponsive Sensors [J].

Paulowicz, Ingo ;

Hrkac, Viktor ;

Kaps, Soeren ;

Cretu, Vasilii ;

Lupan, Oleg ;

Braniste, Tudor ;

Duppel, Viola ;

Tiginyanu, Ion ;

Kienle, Lorenz ;

Adelung, Rainer ;

Mishra, Yogendra Kumar .

ADVANCED ELECTRONIC MATERIALS, 2015, 1 (08)

[10] Effect of RuO2 in the shape selectivity of submicron-sized SnO2 structures [J].

Ramgir, NS ;

Mulla, IS ;

Vijayamohanan, KP .

JOURNAL OF PHYSICAL CHEMISTRY B, 2005, 109 (25) :12297-12303

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