Laser-induced temperature jump electrochemistry on gold nanoparticle-coated electrodes.
Laser-induced temperature jumps (LITJs) at gold nanoparticle-coated indium tin oxide (ITO) electrodes in contact with electrolyte solutions have been measured using temperature-sensitive redox probes and an infrared charge-coupled device. Upon irradiation with 532 nm light, interfacial temperature changes of ca. 20 degrees C were recorded for particle coverages of ca. 1 x 1010 cm-2. In the presence of a redox molecule, LITJ yields open-circuit photovoltages and photocurrents that are proportional to the number of particles on the surface. When ssDNA was used to chemisorb nanoparticles to the ITO surface, solution concentrations as low as 100 fM of target ssDNA-modified nanoparticles could be detected at the electrode surface.
Lowe
Lisa B
LB
Department of Chemistry, North Carolina State University, Raleigh, NC 27695, USA.
Brewer
Scott H
SH
Krämer
Stephan
S
Fuierer
Ryan R
RR
Qian
Guoguang
G
Agbasi-Porter
Chiamaka O
CO
Moses
Selina
S
Franzen
Stefan
S
Feldheim
Daniel L
DL
D004277:DNA, Single-Stranded / Q000032:analysis / Q000737:chemistry*; D004563:Electrochemistry / Q000379:methods*; D004566:Electrodes; D006046:Gold / Q000737:chemistry*; D007204:Indium / Q000737:chemistry; D007834:Lasers; D036103:Nanotechnology; D010316:Particle Size; D020349:Surface Plasmon Resonance; D013696:Temperature; D013817:Thermography / Q000379:methods
D004277:DNA, Single-Stranded; D007204:Indium; C047711:indium oxide; D006046:Gold