Cysteine-capped ZnS nanocrystallites: Preparation and characterization

被引:67
作者
Bae, W [1 ]
Mehra, RK [1 ]
机构
[1] Univ Calif Riverside, Dept Entomol, Environm Toxicol Grad Program, Riverside, CA 92521 USA
关键词
cysteine; dye reduction; gel filtration; glutathione; nanocrystalline semiconductors; photocatalysis; size-selective precipitation; spectroscopy;
D O I
10.1016/S0162-0134(98)10008-9
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Cysteine-capped ZnS nanocrystalline semiconductors (NCs) were prepared by titrating sodium sulfide into preformed Zn-cysteine complexes. Only a maximum of similar to 40% of Zn(LI) in Zn-cysteine complex was converted into ZnS NCs when the reaction was carried out at room temperature for 30 min. However, incubation of the reaction mixture at 45 degrees C for 60 min significantly enhanced the production of ZnS NCs as a maximum of similar to 75% of Zn(II) was converted into NCs. Cysteine capping produced NCs that were smaller than those capped by glutathione. Furthermore, cysteine-capped ZnS exhibited a narrow range of size distribution as suggested by UV/VIS spectroscopy of the NCs separated on a size-fractionation column. Unreacted Zn-cysteine complex could be removed from ZnS NC preparations by selective precipitation with ethanol. The precipitation procedure also led to the isolation of ZnS NCs that appeared more uniform by gel-filtration analysis. Ethanol precipitation procedures allowed preparation of large quantities of powdered NCs which retained their colloidal nature upon resuspension in water or buffers. pH titration experiments indicate that the average size of the particles was smallest in the pH range 7-10, but the size increased as the samples were made acidic or alkaline. Cysteine-capped NCs were capable of causing photoreduction of methylviologen, basic fuchsin and naphthol blue black. (C) 1998 Elsevier Science Inc. All rights reserved.
引用
收藏
页码:125 / 135
页数:11
相关论文
共 47 条
[1]   Organization of 'nanocrystal molecules' using DNA [J].
Alivisatos, AP ;
Johnsson, KP ;
Peng, XG ;
Wilson, TE ;
Loweth, CJ ;
Bruchez, MP ;
Schultz, PG .
NATURE, 1996, 382 (6592) :609-611
[2]   Metal-binding characteristics of a phytochelatin analog (Glu-Cys)(2)Gly [J].
Bae, W ;
Mehra, RK .
JOURNAL OF INORGANIC BIOCHEMISTRY, 1997, 68 (03) :201-210
[3]   Properties of glutathione- and phytochelatin-capped CdS bionanocrystallites [J].
Bae, W ;
Mehra, RK .
JOURNAL OF INORGANIC BIOCHEMISTRY, 1998, 69 (1-2) :33-43
[4]   Characteristics of glutathione-capped ZnS nanocrystallites [J].
Bae, WO ;
Abdullah, R ;
Henderson, D ;
Mehra, RK .
BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS, 1997, 237 (01) :16-23
[5]   THE QUANTUM-MECHANICS OF LARGER SEMICONDUCTOR CLUSTERS (QUANTUM DOTS) [J].
BAWENDI, MG ;
STEIGERWALD, ML ;
BRUS, LE .
ANNUAL REVIEW OF PHYSICAL CHEMISTRY, 1990, 41 :477-496
[6]   HIGHLY MONODISPERSE QUANTUM SIZED CDS PARTICLES BY SIZE-SELECTIVE PRECIPITATION [J].
CHEMSEDDINE, A ;
WELLER, H .
BERICHTE DER BUNSEN-GESELLSCHAFT-PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 1993, 97 (04) :636-637
[7]   Thermoluminescence of ZnS nanoparticles [J].
Chen, W ;
Wang, ZG ;
Lin, ZJ ;
Lin, LY .
APPLIED PHYSICS LETTERS, 1997, 70 (11) :1465-1467
[8]   HIGHER EXCITED ELECTRONIC STATES IN CLUSTERS OF ZNSE, CDSE, AND ZNS - SPIN-ORBIT, VIBRONIC, AND RELAXATION PHENOMENA [J].
CHESTNOY, N ;
HULL, R ;
BRUS, LE .
JOURNAL OF CHEMICAL PHYSICS, 1986, 85 (04) :2237-2242
[9]  
Coffer J. L., 1992, Nanotechnology, V3, P69, DOI 10.1088/0957-4484/3/2/004
[10]   CHARACTERIZATION OF ZINC-SULFIDE NANOCLUSTERS VIA ATOMIC-FORCE AND SCANNING-TUNNELING-MICROSCOPY [J].
COURY, JE ;
PITTS, EC ;
SHORROSH, R ;
FELTON, RH ;
BOTTOMLEY, LA .
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B, 1995, 13 (03) :1167-1171