Citrate adsorption on gold: Understanding the shaping mechanism of nanoparticles
| Autor: | William Cheuquepán, Adolfo Ferre-Vilaplana, Enrique Herrero, Juan M. Feliu, José M. Gisbert-González |
|---|---|
| Přispěvatelé: | Universidad de Alicante. Departamento de Química Física, Universidad de Alicante. Instituto Universitario de Electroquímica, Electroquímica de Superficies |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
General Chemical Engineering
Citrate adsorption Inorganic chemistry Nanoparticle chemistry.chemical_element 02 engineering and technology 010402 general chemistry Electrochemistry 01 natural sciences Analytical Chemistry chemistry.chemical_compound Adsorption 03.- Garantizar una vida saludable y promover el bienestar para todos y todas en todas las edades Dehydrogenation Química Física Chemistry 021001 nanoscience & nanotechnology 0104 chemical sciences Octahedron Shaping mechanism Colloidal gold Nanoparticles Gold 0210 nano-technology Platinum Citric acid LENGUAJES Y SISTEMAS INFORMATICOS |
| Zdroj: | RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia instname RUA. Repositorio Institucional de la Universidad de Alicante Universidad de Alicante (UA) |
| DOI: | 10.1016/j.jelechem.2020.114015 |
| Popis: | [EN] Advanced applications of colloidal nanoparticles (NPs) become to depend on their specific shape, which is controlled by the adsorption behavior of the capping agent involved in their synthesis. To understand the way in which citric acid determines the shape of gold NPs, the adsorption behavior of citrate on gold under the synthesis conditions is here investigated from electrochemical experiments on well-defined surfaces. Gibb excesses and charge numbers for the citrate adlayers deposited on the Au (111), Au(100) and Au(110) electrodes when a potential is applied were estimated at pHs 1 and 3. From these results, FTIR spectra and DFT calculations, it is concluded that solvated citrate can become simultaneously adsorbed through three dehydrogenated carboxylic groups in bidentate configuration on Au(111), but only through two on Au(100) and Au(110). As a result of this behavior, citrate can become more strongly adsorbed on Au(111) than on the other two basal planes of gold under the synthesis conditions, which would explain why tetrahedral and octahedral colloidal gold NPs are preferentially shaped when citric acid is used as the capping agent in water. This conclusion coincides with the previously one obtained on platinum, suggesting that the mechanism here described would operate also on other metals having fcc structure. This work has been financially supported by the MCINN-FEDER (Spain) through project CTQ2016-76221-P. |
| Databáze: | OpenAIRE |
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