THE INVESTIGATION OF REDOX REACTIONS WITH A SCANNING TUNNELING MICROSCOPE - EXPERIMENTAL AND THEORETICAL ASPECTS

被引:83
作者
SCHMICKLER, W
WIDRIG, C
机构
[1] Utah State University, Logan
来源
JOURNAL OF ELECTROANALYTICAL CHEMISTRY | 1992年 / 336卷 / 1-2期
关键词
D O I
10.1016/0022-0728(92)80272-6
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
The tunneling current between the tip and a sample in a scanning tunneling microscope (STM) can be enhanced by the presence of an electroactive adsorbate on the sample. We have used the transfer Hamiltonian mechanism to determine the dependence of this current on various system parameters like the bias voltage, the energy of reorganization, and the electronic coupling of the redox centre to the tip and the substrate. We estimate that a fast redox couple would rise give to currents in the pA to nA range; furthermore, the adsorbate density of states will be reflected in dj/dV. We also discuss experimental considerations in examining electron transfer via a redox adsorbate using an STM.
引用
收藏
页码:213 / 221
页数:9
相关论文
共 22 条
[11]   INTRAMOLECULAR ELECTRON-TRANSFER AT METAL-SURFACES .4. DEPENDENCE OF TUNNELING PROBABILITY UPON DONOR-ACCEPTOR SEPARATION DISTANCE [J].
LI, TTT ;
WEAVER, MJ .
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1984, 106 (20) :6107-6108
[12]  
MU XH, 1990, INORG CHEM, V29, P2879
[13]   EFFECT OF TRAPPING STATES ON TUNNELING IN METAL-SEMICONDUCTOR JUNCTIONS [J].
PARKER, GH ;
MEAD, CA .
APPLIED PHYSICS LETTERS, 1969, 14 (01) :21-&
[14]   NONLOCAL ELECTROSTATIC EFFECTS ON ELECTRON-TRANSFER ACTIVATION-ENERGIES - SOME CONSEQUENCES FOR AND COMPARISONS WITH ELECTROCHEMICAL AND HOMOGENEOUS-PHASE KINETICS [J].
PHELPS, DK ;
KORNYSHEV, AA ;
WEAVER, MJ .
JOURNAL OF PHYSICAL CHEMISTRY, 1990, 94 (04) :1454-1463
[15]  
ROBINSON RS, IN PRESS LANGMUIR
[16]   A THEORY OF ADIABATIC ELECTRON-TRANSFER REACTIONS [J].
SCHMICKLER, W .
JOURNAL OF ELECTROANALYTICAL CHEMISTRY, 1986, 204 (1-2) :31-43
[18]   A MODEL FOR THE SCANNING TUNNELING MICROSCOPE OPERATING IN AN ELECTROLYTE SOLUTION [J].
SCHMICKLER, W ;
HENDERSON, D .
JOURNAL OF ELECTROANALYTICAL CHEMISTRY, 1990, 290 (1-2) :283-291
[19]   THEORY OF RESONANCE TUNNELLING AT FILM-COVERED METAL-ELECTRODES [J].
SCHMICKLER, W .
JOURNAL OF ELECTROANALYTICAL CHEMISTRY, 1977, 82 (1-2) :65-80
[20]  
SCHMICKLER W, UNPUB