Time and temperature dependent formation of hollow gold nanoparticles via galvanic replacement reaction of As(0) and its catalytic application. (8th November 2018)

• Record Type: Journal Article
• Authors: Kalyan, Imon; Pal, Tarasankar; Pal, Anjali
• Is Part Of: MRS communications. Volume 9:Number 1(2019)
• Page Start: 270
• Page End: 279
• Publication Date: 2018-11-08
• Subjects: Materials -- Periodicals; 620.11
• DOI: 10.1557/mrc.2018.214
• Languages: English
• ISSNs: 2159-6859

Abstract

Abstract: Abstract : Two different sized As(0) nanoparticles As1 (50 ± 7 nm) and As2 (70 ± 10 nm) are prepared by reducing arsenite with NaBH4 in the pH range 7–9, at controlled temperature (10 and 40 °C). Further, galvanic replacement reaction is used exploiting the reducing nature of As(0) to prepare two different sized hollow gold nanoparticles (HGNPs) AuNP1 (55 ± 7 nm) and AuNP2 (72 ± 7 nm). These HGNPs exhibit high catalytic activity towards 4-nitrophenol reduction under various conditions following first-order kinetics. AuNP1 shows ~6.6 time higher turnover frequency compared with that of AuNP2 due to its smaller size. Both catalysts are recycle able.