Contradictory Dual Effects: Organothiols Can Induce Both Silver Nanoparticle Disintegration and Formation under Ambient Conditions
| Autor: | Kumudu Siriwardana, Willard E. Collier, Felio Perez, Dongmao Zhang, Ganganath S. Perera, Nuwanthi Suwandaratne |
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| Rok vydání: | 2015 |
| Předmět: |
Reducing agent
Propanethiol Inorganic chemistry Glutathione Photochemistry Fluorescence Silver nanoparticle Surfaces Coatings and Films Electronic Optical and Magnetic Materials chemistry.chemical_compound General Energy chemistry Colloidal gold Oxidizing agent Chelation Physical and Theoretical Chemistry |
| Zdroj: | The Journal of Physical Chemistry C. 119:20975-20984 |
| ISSN: | 1932-7455 1932-7447 |
| DOI: | 10.1021/acs.jpcc.5b05965 |
| Popis: | Using propanethiol (PrT), 2-mercaptoethanol (ME), glutathione (GSH), and cysteine (Cys) as model thiols, we demonstrated herein that organothiols can induce both silver nanoparticle (AgNP) disintegration and formation under ambient conditions by simply mixing organothiols with AgNPs and AgNO3, respectively. Mechanistically, organothiols induce AgNP disintegration by chelating silver ions produced by ambient oxygen oxidizing the AgNPs, while AgNP formation in AgNO3/organothiol mixtures is the result of organothiols serving as the reducing agent. Furthermore, surface-plasmon- and fluorescent-active AgNPs can be interconverted by adding excess Ag+ or ME into the AgNP-containing solutions. Organothiols can also reduce gold ion in HAuCl4/organothiol solutions into fluorescence- and surface-plasmon-active gold nanoparticles (AuNPs), but no AuNP disintegration occurs in the AuNP/organothiol solutions. This work highlights the extraordinary complexity of organothiol interactions with gold and silver nanoparticles... |
| Databáze: | OpenAIRE |
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