Molecular second harmonic generation studies of methylene blue chemisorbed onto a sulfur-modified polycrystalline platinum electrode

Journal Article · Thu May 03 00:00:00 EDT 1990 · Journal of Physical Chemistry; (USA)

DOI:https://doi.org/10.1021/j100372a060· OSTI ID:6381285

Campbell, D J; Higgins, D A; Corn, R M ^[1]

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1. Univ. of Wisconsin, Madison (USA)

The resonant molecular second harmonic generation (SHG) response of a monolayer of adsorbed methylene blue is studied in situ on a polycrystalline platinum electrode modified by the deposition of a monolayer of chemisorbed sulfur. The sulfur monolayer prevents the irreversible decomposition of the dye molecules on the platinum electrode and ensures that the contributions to the surface nonlinear susceptibility from the metal and from the methylene blue remain separable. At an incident angle of 40{degree}, the resonant molecular SHG signal from the methylene blue monolayer dominates the nonlinear optical response of the interface, and the potential dependence of the resonant SHG signal matches that expected during the electrochemical reduction and reoxidation of the chemisorbed methylene blue.

• OSTI ID: 6381285
• Journal Information: Journal of Physical Chemistry; (USA), Vol. 94:9; ISSN 0022-3654
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ELECTRODES
CHEMISORPTION
DATA ANALYSIS
EXPERIMENTAL DATA
HARMONIC GENERATION
MEASURING INSTRUMENTS
MEASURING METHODS
METHYLENE BLUE
PLATINUM
SULFUR
AMINES
ANTI-INFECTIVE AGENTS
ANTIMICROBIAL AGENTS
AZINES
CHEMICAL REACTIONS
CHLORIDES
CHLORINE COMPOUNDS
DATA
DRUGS
ELEMENTS
FREQUENCY MIXING
HALIDES
HALOGEN COMPOUNDS
HETEROCYCLIC COMPOUNDS
INFORMATION
METALS
NONMETALS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC SULFUR COMPOUNDS
PHENOTHIAZINES
PLATINUM METALS
SEPARATION PROCESSES
SORPTION
TRANSITION ELEMENTS
400201* - Chemical & Physicochemical Properties