Gold nanoparticle superlattices as functional solids for concomitant conductivity and SERS tuning

Autor: Jobin Cyriac, Thalappil Pradeep, Edakkattuparambil Sidharth Shibu, Jaydeb Chakrabarti
Jazyk: angličtina
Rok vydání: 2011
Předmět:
Materials science
Macromolecular Substances
Surface Properties
Superlattice
Adsorbed gas
Air water interfaces
Four-probe measurement
Gold Nanoparticles
Length scale
Linear dependence
Mercaptosuccinic acids
Nanometres
Ohmic conduction
Polarizabilities
Probe molecules
Self-assemble
Simple model calculations
Crystals
Current voltage characteristics
Gas adsorption
Gold
Nanoparticles
Polarization
Probes
Superlattices
Phase interfaces
Analytical chemistry
Electric Conductivity
Molecular Conformation
Nanoparticle
Conductance
Conductivity
Surface Plasmon Resonance
Nanostructures
Condensed Matter::Materials Science
Adsorption
Models
Chemical
Polarizability
Electrical resistivity and conductivity
Materials Testing
General Materials Science
Nanometre
Computer Simulation
Physics::Chemical Physics
Particle Size
Zdroj: IndraStra Global.
ISSN: 2381-3652
Popis: Mercaptosuccinic acid protected gold nanoparticles (Au@MSA) self assemble to form superlattice (SL) crystals at the air-water interface. These have been used for gas adsorption. The current-voltage (I-V) characteristics of the SL film with embedded SL crystals, obtained by four probe measurements, show Ohmic conduction. The conductance observed was proportional to the polarizability of the adsorbed gases. The current through the SL decreases on adsorption of the gas along with decrease in the SERS intensity of a probe molecule from the crystals. We rationalise our observation of the linear dependence of the conductance on the polarizability of the adsorbed gas using a simple model calculation. Variation of the conductance may be useful in designing electrical switches operating at the nanometre length scales. � 2011 The Royal Society of Chemistry.
Databáze: OpenAIRE
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