Growth of Nb2O5 quantum dots by physical vapor deposition

被引：13

作者：

Dhawan, Sahil ^{[1
]}

Dhawan, Tanuj ^{[2
]}

Vedeshwar, Agnikumar G. ^{[1
]}

机构：

[1] Univ Delhi, Dept Phys & Astrophys, Thin Film Lab, Delhi 110007, India

[2] Univ Delhi, Hans Raj Coll, Dept Phys & Elect, Delhi 110007, India

来源：

MATERIALS LETTERS | 2014年 / 126卷

关键词：

Physical vapor deposition; Quantum dots; Nb2O5; UV-visible and electron microscopy; NIOBIUM; NANOPARTICLES; TA2O5;

D O I：

10.1016/j.matlet.2014.03.107

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The crystalline quantum dots of Nb2O5 in the range 1-20 nm have been grown by vacuum thermal evaporation using the bottom-up approach of early nucleation and growth stage. The dot sizes were controlled by growth time for an optimized constant molecular flux rate of growth. The dots were characterized by TEM and UV/Vis absorption spectroscopy. The variation of optical band gap of dots scaling with inverse square of their size demonstrates the quantum confinement effect in the dots. The reduced mass of electron-hole pair (exciton) was determined to be 0.532 m(e) from this behavior. (C) 2014 Elsevier B.V. All rights reserved.

引用

页码：32 / 35

页数：4

共 16 条

[11] Low-temperature synthesis of niobium oxide nanoparticles from peroxo niobic acid sol [J].

Uekawa, N ;

Kudo, T ;

Mori, F ;

Wu, YJ ;

Kakegawa, K .

JOURNAL OF COLLOID AND INTERFACE SCIENCE, 2003, 264 (02) :378-384

[12] Temperature stability of sputtered niobium-oxide films [J].

Venkataraj, S ;

Drese, R ;

Liesch, C ;

Kappertz, O ;

Jayavel, R ;

Wuttig, M .

JOURNAL OF APPLIED PHYSICS, 2002, 91 (08) :4863-4871

[13] Formation of Nb2O5 nanotube Arrays through phase transformation [J].

Yan, Chenglin ;

Xue, Dongfeng .

ADVANCED MATERIALS, 2008, 20 (05) :1055-+

[14] Multiple NaNbO3/Nb2O5 Heterostructure Nanotubes: A New Class of Ferroelectric/Semiconductor Nanomaterials [J].

Yan, Chenglin ;

Nikolova, Liya ;

Dadvand, Afshin ;

Harnagea, Catalin ;

Sarkissian, Andranik ;

Perepichka, Dmitrii F. ;

Xue, Dongfeng ;

Rosei, Federico .

ADVANCED MATERIALS, 2010, 22 (15) :1741-+

[15] Low-dimensional systems: quantum size effects and electronic properties of semiconductor microcrystallites (zero-dimensional systems) and some quasi-two-dimensional systems [J].

Yoffe, AD .

ADVANCES IN PHYSICS, 2002, 51 (02) :799-890

[16] Preparation and characterization of porous Nb2O5 nanoparticles [J].

Zhou, Yuanyuan ;

Qw, Zifeng ;

Lue, Mengkai ;

Zhang, Aiyu ;

Ma, Qian .

MATERIALS RESEARCH BULLETIN, 2008, 43 (06) :1363-1368

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