Atomic level studies of selenium electrodeposition on gold(111) and gold(110)

被引:86
作者
Lister, TE [1 ]
Stickney, JL [1 ]
机构
[1] UNIV GEORGIA,DEPT CHEM,ATHENS,GA 30602
关键词
D O I
10.1021/jp9621540
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Studies of the electrodeposition of Se atomic layers on Au(111) and Au(110) are presented. Three electrochemical methods of forming Se atomic layers were investigated: reductive deposition, oxidative stripping of bulk Se, and reductive stripping of bulk Se. The resulting Se atomic layers were studied using low-energy electron diffraction (LEED) and scanning tunneling microscopy (STM). LEED indicated the formation of Au(111)(root 3 x root 3)R30 degrees-Se and Au(110)(2 x 3)-Se structures. STM analysis confirmed the presence of those structures along with several others. At low Se coverages on Au(lll), a mosaic structure was formed, composed of a large number of small domains of a (root 3 x root 3)R30 degrees-Se structure, separated by areas void of Se. At higher coverages, near 1/3, the (root 3 x root 3)R30 degrees structure covered most of the surface, except for a number of linear phase boundaries. Commensurate with completion of the (root 3 x root 3)R30 degrees structure, some domains of square Se-8 rings were usually evident, as well. At still higher coverages, a heterogeneous surface was formed, composed of a complex network of rings, chains, clusters, and pits. This heterogeneity appears to result from slow deposition kinetics, probably the result of both a low exchange current and low Se surface mobility. Some of the kinetic sluggishness may have resulted from the need to translate whole domains of Se atoms from one site to another, in order to remove phase boundaries. STM studies of the Au(110) surface indicated that only the (2 x 3) structure was formed at coverages much below 1 monolayer and that it was formed homogeneously. At monolayer coverages and above, a honeycomb structure composed of chains of Se atoms was observed, which filled in at still higher coverages to complete a second Se layer.
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页码:19568 / 19576
页数:9
相关论文
共 39 条
[1]   MOCVD OF GROUP-III CHALCOGENIDES [J].
BARREN, AR .
ADVANCED MATERIALS FOR OPTICS AND ELECTRONICS, 1995, 5 (05) :245-258
[2]  
Bedair S., 1992, ATOMIC LAYER EPITAXY
[3]   ANODIC UNDERPOTENTIAL DEPOSITION AND CATHODIC STRIPPING OF IODINE AT POLYCRYSTALLINE AND SINGLE-CRYSTAL GOLD - STUDIES BY LEED, AES, XPS, AND ELECTROCHEMISTRY [J].
BRAVO, BG ;
MICHELHAUGH, SL ;
SORIAGA, MP ;
VILLEGAS, I ;
SUGGS, DW ;
STICKNEY, JL .
JOURNAL OF PHYSICAL CHEMISTRY, 1991, 95 (13) :5245-5249
[4]   THIN-LAYER ELECTROCHEMICAL STUDIES OF THE OXIDATIVE UNDERPOTENTIAL DEPOSITION OF SULFUR AND ITS APPLICATION TO THE ELECTROCHEMICAL ATOMIC LAYER EPITAXY DEPOSITION OF CDS [J].
COLLETTI, LP ;
TEKLAY, D ;
STICKNEY, JL .
JOURNAL OF ELECTROANALYTICAL CHEMISTRY, 1994, 369 (1-2) :145-152
[5]  
DAPKUS PD, 1991, ATOMIC LAYER GROWTH, P222
[6]   Reconstruction of cadmium sulfide monolayers on Au(100) [J].
Demir, U ;
Shannon, C .
LANGMUIR, 1996, 12 (02) :594-596
[7]   A SCANNING-TUNNELING-MICROSCOPY STUDY OF ELECTROCHEMICALLY GROWN CADMIUM-SULFIDE MONOLAYERS ON AU(111) [J].
DEMIR, U ;
SHANNON, C .
LANGMUIR, 1994, 10 (08) :2794-2799
[8]   ELECTROCHEMICAL-BEHAVIOR OF IRREVERSIBLY ADSORBED SELENIUM DOSED FROM SOLUTION ON PT(H,K,L) SINGLE-CRYSTAL ELECTRODES IN SULFURIC AND PERCHLORIC-ACID MEDIA [J].
FELIU, JM ;
GOMEZ, R ;
LLORCA, MJ ;
ALDAZ, A .
SURFACE SCIENCE, 1993, 289 (1-2) :152-162
[9]   PROBING REDOX-INDUCED MOLECULAR-TRANSFORMATIONS BY ATOMIC-RESOLUTION SCANNING TUNNELING MICROSCOPY - IODIDE ADSORPTION AND ELECTROOXIDATION ON AU(111) IN AQUEOUS-SOLUTION [J].
GAO, XP ;
WEAVER, MJ .
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1992, 114 (22) :8544-8551
[10]   A TANDEM MICROSCOPIC-ELECTROCHEMICAL EXAMINATION OF A CHARGE-INDUCED SURFACE PHASE SEQUENCE - ORDERED AU(110) IN AQUEOUS IODIDE ELECTROLYTES AS PROBED BY POTENTIODYNAMIC SCANNING-TUNNELING-MICROSCOPY [J].
GAO, XP ;
EDENS, GJ ;
WEAVER, MJ .
JOURNAL OF PHYSICAL CHEMISTRY, 1994, 98 (33) :8074-8085