Title: Improvement of optical reactivity for nano-TiO2 film by nitrogen ECR plasma
Author(s): Xiong YY, Ma T, Kong LH, Chen JF, Wu XQ, Yu HH, Zhang ZX
Source: JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 22 (3): 353-358 MAY 2006
Document Type: Article
Language: English
Cited References: 22 Times Cited: 0
Abstract: Nitrogen ion was implanted into the nano-TiO2 film surfaces by electron cyclotron resonance (ECR) plasma modification to improve the optical reactivity in visible-light region for nano-TiO2. Diagnosing the N-2 plasma by optical emission spectroscopy (OES) was applied to the process of plasma modification. X-ray photoelectron spectroscopy (XPS) was used for analysis of the binding of element after plasma modification. It is shown that the surface modification was caused by excitated N. The injecting of N-2 and N-2(+) leads to the increase in the dissociative interstitial state N in the films. The doped N makes for TiO2-xNx appearing in the TiO2 films. TiO2-xNx forms the impurity energy state in the TiO2 energy band gap and reduces the energy band gap. This is the main reason leading to the red shift of absorption edge.
Author Keywords: ECR plasma surface treatment; titanium dioxide nitrogen doping; optical emission spectroscopy; X-ray photoelectron spectroscopy
KeyWords Plus: PULSED-LASER DEPOSITION; THIN-FILMS; TITANIUM; TIO2; COATINGS; SURFACE; XPS
Addresses: Xiong YY (reprint author), Xian Jiaotong Univ, Sch Life Sci & Technol, Xian, 710049 Peoples R China
Xian Jiaotong Univ, Sch Life Sci & Technol, Xian, 710049 Peoples R China
S China Normal Univ, Sch Phys & Telecommun Engn, Guangzhou, 510631 Peoples R China
E-mail Addresses: xiongyy@scnu.edu.cn
Publisher: JOURNAL MATER SCI TECHNOL, 72 WENHUA RD, SHENYANG 110015, PEOPLES R CHINA
Subject Category: MATERIALS SCIENCE, MULTIDISCIPLINARY; METALLURGY & METALLURGICAL ENGINEERING
IDS Number: 051AX

ISSN: 1005-0302


Title: Suppression of direct spin Hall currents in two-dimensional electronic systems with both Rashba and Dresselhaus spin-orbit couplings
Author(s): Xiong JW, Hu LB, Zhang ZX
Source: CHINESE PHYSICS LETTERS 23 (5): 1278-1281 MAY 2006
Document Type: Article
Language: English
Cited References: 20 Times Cited: 0
Abstract: Based on the Heisenberg equations of motion for the electron orbital and spin degrees of freedom in two-dimensional electronic systems with both Rashba and Dresselhaus spin-orbit couplings, we show that an ac electric field can cause an ac spin Hall current in such a system. In contrast to some previous theoretical prediction, the spin Hall current will be suppressed completely in the dc limit. We argue that the suppression of dc spin Hall currents in such a system is actually a much natural result of the dynamic spin evolution due to the combined action of a dc external electric field and the intrinsic spin-orbit coupling.
KeyWords Plus: INJECTION; SEMICONDUCTORS
Addresses: Xiong JW (reprint author), Xian Jiaotong Univ, Sch Life Sci & Technol, Minist Educ, Key Lab Biomed Informat Engn, Xian, 710049 Peoples R China
Xian Jiaotong Univ, Sch Life Sci & Technol, Minist Educ, Key Lab Biomed Informat Engn, Xian, 710049 Peoples R China
S China Normal Univ, Dept Phys, Guangzhou, 510631 Peoples R China
E-mail Addresses: jwxiong@scnu.edu.cn
Publisher: IOP PUBLISHING LTD, DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND
Subject Category: PHYSICS, MULTIDISCIPLINARY
IDS Number: 042TF

ISSN: 0256-307X