On the spatially resolved electronic structure of polycrystalline WO3 films investigated with scanning tunneling spectroscopy

被引：24

作者：

Ottaviano, L

Lozzi, L

Passacantando, M

Santucci, S

机构：

[1] INFM, Unita Aquila, I-67010 Coppito, Italy

[2] Univ Aquila, Dipartimento Fis, I-67010 Coppito, Italy

来源：

SURFACE SCIENCE | 2001年 / 475卷 / 1-3期

关键词：

scanning tunneling microscopy; scanning tunneling spectroscopies; electrical transport (conductivity; resistivity; mobility; etc.); surface structure; morphology; roughness; and topography; tungsten oxide; polycrystalline thin films; grain boundaries;

D O I：

10.1016/S0039-6028(00)01075-X

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：

The electronic structure of polycrystalline monoclinic WO3 was been investigated by means of scanning tunneling spectroscopy in ultrahigh vacuum. Current image tunneling spectroscopy maps show a clear and systematic increase of the conductance of the surface at the WO3 crystallite boundaries, with a corresponding decrease of the bandwidth. This effect is assigned to the occurrence of sigma bonded electronic states lying deep in the bulk band gap, and due to pairing of reduced W ions at intersection planes between adjacent crystallites. Significant presence of pi bonding states at the Fermi level has been also detected at these crystallites boundaries. (C) 2001 Elsevier Science B.V. All rights reserved.

引用

页码：73 / 82

页数：10

共 25 条

[1]

ANDO DM, 1994, CHEM LETT, V5, P335

[2] MICROSTRUCTURAL EFFECTS IN WO3 GAS-SENSING FILMS [J].

ANTONIK, MD ;

SCHNEIDER, JE ;

WITTMAN, EL ;

SNOW, K ;

VETELINO, JF .

THIN SOLID FILMS, 1995, 256 (1-2) :247-252

[3] BULK AND SURFACE ELECTRON-STATES IN WO3 AND TUNGSTEN BRONZES [J].

BULLETT, DW .

JOURNAL OF PHYSICS C-SOLID STATE PHYSICS, 1983, 16 (11) :2197-2207

[4] Electronic states at oxygen deficient WO3(001) surfaces:: a study by resonant photoemission [J].

Dixon, RA ;

Williams, JJ ;

Morris, D ;

Rebane, J ;

Jones, FH ;

Egdell, RG ;

Downes, SW .

SURFACE SCIENCE, 1998, 399 (2-3) :199-211

[5]

Goodenough J. B., 1971, PROGR SOLID STATE CH, V5, P145, DOI DOI 10.1016/0079-6786(71)90018-5

[6] Influence of metal-metal bonds on electron spectra of MoO2 and WO2 [J].

Gulino, A ;

Parker, S ;

Jones, FH ;

Egdell, RG .

JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS, 1996, 92 (12) :2137-2141

[7] Effects of gap states an scanning tunneling spectra observed on (110)- and (001)-oriented clean surfaces and ultrathin Si layer covered surfaces of GaAs prepared by molecular beam epitaxy [J].

Hasegawa, H ;

Negoro, N ;

Kasai, S ;

Ishikawa, Y ;

Fujikuwa, H .

JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B, 2000, 18 (04) :2100-2108

[8] Electronic structure and optical properties of WO3, LiWO3, NaWO3, and HWO3 [J].

Hjelm, A ;

Granqvist, CG ;

Wills, JM .

PHYSICAL REVIEW B, 1996, 54 (04) :2436-2445

[9] ON THE ELECTROCHEMICAL ETCHING OF TIPS FOR SCANNING TUNNELING MICROSCOPY [J].

IBE, JP ;

BEY, PP ;

BRANDOW, SL ;

BRIZZOLARA, RA ;

BURNHAM, NA ;

DILELLA, DP ;

LEE, KP ;

MARRIAN, CRK ;

COLTON, RJ .

JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS, 1990, 8 (04) :3570-3575

[10] SUPERSTRUCTURES AND DEFECT STRUCTURES REVEALED BY ATOMIC-SCALE STM IMAGING OF WO3(001) [J].

JONES, FH ;

RAWLINGS, K ;

FOORD, JS ;

COX, PA ;

EGDELL, RG ;

PETHICA, JB ;

WANKLYN, BMW .

PHYSICAL REVIEW B, 1995, 52 (20) :14392-14395

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