박하나 Yoon, Su-Jin 남윤식 이지영 이연희 김진영 이강봉 2024-01-12T06:32:52Z 2024-01-12T06:32:52Z 2023-11-13 2023-11 2046-2069 https://pubs.kist.re.kr/handle/201004/79770 A gold nanourchin (AuNU) probe with a novel sensing mechanism for monitoring H2S was developed as a feasible colorimetric sensor. In this study, AuNUs that are selectively responsive to H2S were fabricated in the presence of trisodium citrate and 1,4-hydroquinone using a seed-mediated approach. Upon exposure of the AuNU solution to H2S, the hydrosulfide ions (HS？) in the solution are converted into oligomeric sulfides by 1,4-hydroquinone used as a reducing agent during the synthesis of AuNUs. The oligomeric sulfides formed in the AuNU solution upon the addition of H2S were found to coat the surface of the AuNUs, introducing a blue shift in absorption accompanied by a color change in the solution from sky blue to light green. This colorimetric alteration by the capping of oligomeric sulfides on the surface of AuNUs is unique compared to well-known color change mechanisms, such as aggregation, etching, or growth of nanoparticles. The novel H2S sensing mechanism of the AuNUs was characterized using UV-Vis spectroscopy, high-resolution transmission microscopy, X-ray photoelectron spectroscopy, surface-enhanced Raman spectroscopy, secondary ion mass spectroscopy, liquid chromatography-tandem mass spectrometry, and atom probe tomography. H2S was reliably monitored with two calibration curves comprising two sections with different slopes according to the low (0.3？15 μM) and high (15.0？300 μM) concentration range using the optimized AuNU probe, and a detection limit of 0.29 μM was obtained in tap water. English Royal Society of Chemistry Novel H2S sensing mechanism derived from the formation of oligomeric sulfide capping the surface of gold nanourchins Article 10.1039/d3ra05527b 1 RSC Advances, v.13, no.47, pp.33028 - 33037 RSC Advances 13 47 33028 33037 Y scie scopus 001101353100001 Chemistry, Multidisciplinary Chemistry Article HYDROGEN-SULFIDE NANOPARTICLE GROWTH