Semiconductor particles in bilayer lipid membranes. Formation, characterization, and photoelectrochemistry
Bilayer lipid membranes (BLMs) have been formed from bovine brain phosphatidylserine (PS), glyceryl monooleate (GMO), and a ploymerizable surfactant, (n-C/sub 15/H/sub 31/CO/sub 2/(CH/sub 2/))/sub 2/N/sup +/(CH/sub 3/)CH/sub 2/C/sub 6/H/sub 4/CH==CH/sub 2/Cl/sup -/(STYRS). These BLMs were then used to provide matrices for the in situ generation of microcrystalline CdS, CuS, Cu/sub 2/S, PbS, ZnS, HgS, and In/sub 2/S/sub 3/. Semiconductors were formed by injecting appropriate metal ion precursors and H/sub 2/S into the bathing solutions on opposite sides of the BLM. Their presence was established by voltage-dependent capacitance measurements, absorption spectroscopy, and optical microscopy. Subsequent to the injection of H/sub 2/S, the first observable change was the appearance of fairly uniform white dots on the black film. These dots rapidly moved around and grew in size, forming islands that then merged with themselves and with a second generation of dots, which ultimately led to a continuous film that continued to grow in thickness. Film formation and growth were monitored by simultaneous optical thickness and capacitance measurements. These data were treated in terms of an equivalent R-C circuit and allowed for the assessment of the semiconductor penetration depth into the BLM. This value for a GMO-BLM-supported In/sub 2/S/sub 3/ film was determined to be 24 A. Bandgap excitation, by nanosecond-pulsed or continuous illumination of the BLM-supported semiconductor film, led to observable photoelectric effects. Visible light (lambda > 350 nm) excitation into STYRS-BLM-supported CdS led to polymerization of the styrene moiety of STYRS. BLM-supported semiconductors remained stable for days.
- Research Organization:
- Syracuse Univ., NY
- OSTI ID:
- 5523149
- Journal Information:
- J. Am. Chem. Soc.; (United States), Journal Name: J. Am. Chem. Soc.; (United States) Vol. 110:4; ISSN JACSA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360603 -- Materials-- Properties
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
400400 -- Electrochemistry
400500 -- Photochemistry
ABSORPTION SPECTROSCOPY
CADMIUM COMPOUNDS
CADMIUM SULFIDES
CAPACITANCE
CHALCOGENIDES
CHEMICAL PREPARATION
CHEMISTRY
COPPER COMPOUNDS
COPPER SULFIDES
DATA
ELECTRICAL PROPERTIES
ELECTROCHEMISTRY
EXPERIMENTAL DATA
FILMS
INDIUM COMPOUNDS
INDIUM SULFIDES
INFORMATION
INORGANIC PHOSPHORS
LAYERS
LEAD COMPOUNDS
LEAD SULFIDES
LIPIDS
MATERIALS
MEMBRANES
MERCURY COMPOUNDS
MERCURY SULFIDES
MICROSCOPY
NUMERICAL DATA
OPTICAL MICROSCOPY
ORGANIC COMPOUNDS
PERFORMANCE
PHOSPHORS
PHOTOCHEMISTRY
PHYSICAL PROPERTIES
SEMICONDUCTOR MATERIALS
SPECTROSCOPY
SULFIDES
SULFUR COMPOUNDS
SYNTHESIS
THIN FILMS
TRANSITION ELEMENT COMPOUNDS
ZINC COMPOUNDS
ZINC SULFIDES