Effect of size on momentum distribution of electrons around vacancies in NiO nanoparticles

doi:10.1088/1674-1056/24/4/046102

›› 2015, Vol. 24 ›› Issue (4): 46102-046102.doi: 10.1088/1674-1056/24/4/046102

• CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES • 上一篇下一篇

Effect of size on momentum distribution of electrons around vacancies in NiO nanoparticles

Anjan Das^a, Atis Chandra Mandal^b, P. M. G. Nambissan^c

a Department of Physics, A.P.C. Roy Government College, Siliguri, Darjeeling 734010, West Bengal, India;
b Department of Physics, University of Burdwan, Golapbag, Burdwan 713104, West Bengal, India;
c Applied Nuclear Physics Division, Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Kolkata 700064, India

收稿日期:2014-09-23 修回日期:2014-12-08 出版日期:2015-04-05 发布日期:2015-04-05

Effect of size on momentum distribution of electrons around vacancies in NiO nanoparticles

Anjan Das^a, Atis Chandra Mandal^b, P. M. G. Nambissan^c

a Department of Physics, A.P.C. Roy Government College, Siliguri, Darjeeling 734010, West Bengal, India;
b Department of Physics, University of Burdwan, Golapbag, Burdwan 713104, West Bengal, India;
c Applied Nuclear Physics Division, Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Kolkata 700064, India

Received:2014-09-23 Revised:2014-12-08 Online:2015-04-05 Published:2015-04-05
Contact: Anjan Das E-mail:anjan802002@yahoo.co.in

摘要/Abstract

摘要： Very small nickel oxide nanoparticles were prepared by a sol-gel procedure using nickel nitrate hexahydrate and ammonium hydroxide as precursors. The particles are in the range of 5 nm-11 nm. The x-ray diffraction (XRD) crystallography and high resolution transmission electron microscopy (HRTEM) were employed to characterize the samples. They were found to be polycrystalline in nature and fcc (NaCl-type) in structure, with the lattice parameter varying with annealing temperature. HRTEM pictures show that the as-prepared samples are hexagonal in shape. Positron annihilation spectroscopy was used to investigate the Doppler-broadened spectra of the samples. The S and W parameters revealed that the chemical surroundings and momentum distribution of the vacancy clusters vary with crystallite size.

关键词: nanoparticles, semiconductor, defect cluster, positron annihilation, sol-gel

Abstract: Very small nickel oxide nanoparticles were prepared by a sol-gel procedure using nickel nitrate hexahydrate and ammonium hydroxide as precursors. The particles are in the range of 5 nm-11 nm. The x-ray diffraction (XRD) crystallography and high resolution transmission electron microscopy (HRTEM) were employed to characterize the samples. They were found to be polycrystalline in nature and fcc (NaCl-type) in structure, with the lattice parameter varying with annealing temperature. HRTEM pictures show that the as-prepared samples are hexagonal in shape. Positron annihilation spectroscopy was used to investigate the Doppler-broadened spectra of the samples. The S and W parameters revealed that the chemical surroundings and momentum distribution of the vacancy clusters vary with crystallite size.

Key words: nanoparticles, semiconductor, defect cluster, positron annihilation, sol-gel

中图分类号: (Structure of nanocrystals and nanoparticles ("colloidal" quantum dots but not gate-isolated embedded quantum dots))

61.46.Df

61.82.Fk (Semiconductors) 61.72.J- (Point defects and defect clusters) 78.70.Bj (Positron annihilation)

Anjan Das, Atis Chandra Mandal, P. M. G. Nambissan. Effect of size on momentum distribution of electrons around vacancies in NiO nanoparticles[J]. , 2015, 24(4): 46102-046102.

Anjan Das, Atis Chandra Mandal, P. M. G. Nambissan. Effect of size on momentum distribution of electrons around vacancies in NiO nanoparticles[J]. Chin. Phys. B, 2015, 24(4): 46102-046102.

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Effect of size on momentum distribution of electrons around vacancies in NiO nanoparticles

Effect of size on momentum distribution of electrons around vacancies in NiO nanoparticles

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