Lee, Sujin Nam, Yun-Sik Choi, Sung-Hee Lee, Yeonhee Lee, Kang-Bong 2024-01-20T03:02:28Z 2024-01-20T03:02:28Z 2021-09-05 2016-11 0026-3672 https://pubs.kist.re.kr/handle/201004/123493 The authors show that gold nanorods (AuNRs) are viable optical nanoprobes for the determination of cyanide ions. The method is based on the measurement of localized surface plasmon resonance (SPR) absorption which strongly depends on the width-to-height ratio of AuNRs. AuNRs are selectively etched by cyanide at the transverse faces, this leading to a decrease in the AuNR aspect ratio and resulting in a blue-shifted SPR absorption and color change from peacock blue to pink. The mechanism of selective etching of the AuNR tips was studied, and optimum conditions for etching were established. The absorption ratio of transverse to longitudinal SPR absorptions (at 538 and 640 nm, respectively) was proportional to the concentration of cyanide in the range from 1.65 nM to 0.5 mM, with a 0.5 nM detection limit. This colorimetric assay is selective, sensitive, and has been successfully applied to quantify cyanide in spiked tap, pond, and waste water. English Springer Verlag SILVER NANOPARTICLES AQUEOUS-MEDIA QUANTUM DOTS LABEL-FREE IONS SENSOR Highly sensitive photometric determination of cyanide based on selective etching of gold nanorods Article 10.1007/s00604-016-1952-y 1 Microchimica Acta, v.183, no.11, pp.3035 - 3041 Microchimica Acta 183 11 3035 3041 scie scopus 000386069400024 2-s2.0-84988731021 Chemistry, Analytical Chemistry Article SILVER NANOPARTICLES AQUEOUS-MEDIA QUANTUM DOTS LABEL-FREE IONS SENSOR Colorimetry AuNR-based assay CTAB Micelles Surface plasmon resonance Transverse to longitudinal SPR Indicator-free AuNRs