Structure and electrocompression of electrodeposited iodine monolayers on Au(111)

Journal Article · Thu Jan 20 00:00:00 EST 1994 · Journal of Physical Chemistry; (United States)

DOI:https://doi.org/10.1021/j100054a026· OSTI ID:5064787

Ocko, B M; Watson, G M; Wang, J ^[1]

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1. Brookhaven National Lab., Upton, NY (United States)

The structure of electrodeposited iodine - from a potassium iodide (KI) electrolyte - at the Au(111) surface has been investigated using surface X-ray scattering (SXS) techniques. Two distinct incommensurate iodine monolayer phases are observed. In both of these phases the structures compress with increasing potential (electrocompression). In the lower potential phase a (px[radical]3) centered-rectangular iodine monolayer is observed in which the coverage ([theta]) increases from 36.6% to 40.9% (relative to the gold layer density) with increasing potential. At more positive potentials a rotated-hexagonal phase is formed, and [theta] increases from 41.5% to 44.5%. At the highest coverages, in both phases, the iodine-iodine nearest-neighbor spacing equals the van der Waals diameter of 4.3 [angstrom]. Analysis of the specular reflectivity gives an iodine-gold interlayer spacing of 2.35 [angstrom] and iodine coverages which are in good agreement with the in-plane diffraction results. 35 refs., 10 refs.

• DOE Contract Number: AC02-76CH00016
• OSTI ID: 5064787
• Journal Information: Journal of Physical Chemistry; (United States), Vol. 98:3; ISSN 0022-3654
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
IODINE
CRYSTAL STRUCTURE
ELECTRODEPOSITION
GOLD
SCATTERING
X RADIATION
DEPOSITION
ELECTROLYSIS
ELECTROMAGNETIC RADIATION
ELEMENTS
HALOGENS
IONIZING RADIATIONS
LYSIS
METALS
NONMETALS
RADIATIONS
SURFACE COATING
TRANSITION ELEMENTS
400400* - Electrochemistry
400101 - Activation
Nuclear Reaction
Radiometric & Radiochemical Procedures