金纳米颗粒包覆电极上的激光诱导温度跃升电化学

Laser-induced temperature jump electrochemistry on gold nanoparticle-coated electrodes.

作者信息

Lowe Lisa B, Brewer Scott H, Krämer Stephan, Fuierer Ryan R, Qian Guoguang, Agbasi-Porter Chiamaka O, Moses Selina, Franzen Stefan, Feldheim Daniel L

机构信息

Department of Chemistry, North Carolina State University, Raleigh, NC 27695, USA.

出版信息

J Am Chem Soc. 2003 Nov 26;125(47):14258-9. doi: 10.1021/ja036672h.

DOI:10.1021/ja036672h

PMID:14624557

Abstract

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.

摘要

已使用温度敏感氧化还原探针和红外电荷耦合器件测量了与电解质溶液接触的金纳米颗粒包覆的氧化铟锡（ITO）电极上的激光诱导温度跃变（LITJ）。在用532 nm光照射时，对于约1×10¹⁰ cm⁻²的颗粒覆盖率，记录到约20℃的界面温度变化。在存在氧化还原分子的情况下，LITJ产生与表面上颗粒数量成比例的开路光电压和光电流。当使用单链DNA（ssDNA）将纳米颗粒化学吸附到ITO表面时，在电极表面可以检测到低至100 fM的目标ssDNA修饰纳米颗粒的溶液浓度。