Growth and branching of gold nanoparticles through mesoporous silica thin films
Composite materials made of mesoporous oxide thin films containing metallic nanoparticles are of high interest in various fields, including catalysis, biosensing and non-linear optics. We demonstrate in this work the fabrication of such composite materials containing a sub-monolayer of gold nanopart...
Guardado en:
| Publicado: |
2012
|
|---|---|
| Materias: | |
| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_20403364_v4_n3_p931_Angelome http://hdl.handle.net/20.500.12110/paper_20403364_v4_n3_p931_Angelome |
| Aporte de: |
| id |
paper:paper_20403364_v4_n3_p931_Angelome |
|---|---|
| record_format |
dspace |
| spelling |
paper:paper_20403364_v4_n3_p931_Angelome2023-06-08T16:33:02Z Growth and branching of gold nanoparticles through mesoporous silica thin films Anisotropic particles Ascorbic acids Biosensing Cetyl trimethyl ammonium bromides Gold Nanoparticles Growth process In-situ Initial shape Mesoporous films Mesoporous oxides Mesoporous Silica Mesoporous silica thin films Metallic nanoparticles Reaction parameters Seeded growth Well-covered Composite materials Gold Ketones Metallic compounds Monolayers Nanoparticles Optical properties Organic acids Surface active agents Thin films Film growth Composite materials made of mesoporous oxide thin films containing metallic nanoparticles are of high interest in various fields, including catalysis, biosensing and non-linear optics. We demonstrate in this work the fabrication of such composite materials containing a sub-monolayer of gold nanoparticles (GNPs) of various shapes covered with mesoporous silica thin films. Additionally, the shape of the GNPs (and thus their optical properties) can be modified in situ through seeded growth and branching. Such growth proceeds upon wetting with HAuCl 4 solution, a surfactant (cetyltrimethylammonium bromide, CTAB) and a mild reducing agent (ascorbic acid, AA). The effect of varying several reaction parameters (time and CTAB and AA concentrations) was evaluated, showing that more anisotropic particles are obtained at longer reaction times, lower CTAB concentration and higher AA concentration. The final shape of the GNPs was also found to depend on their initial shape and size, as well as the pore size of the mesoporous film covering them. Because the growth proceeds through the pores of the film, it may lead to shapes that are not easily obtained in solution, such as particles with branches on one side only. Finally, we have confirmed that no damage was induced to the mesoporous silica structure during the growth process and thus the final particles remain well covered by the thin film, which can eventually be used as a filter between the GNPs and the outer medium. © 2012 The Royal Society of Chemistry. 2012 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_20403364_v4_n3_p931_Angelome http://hdl.handle.net/20.500.12110/paper_20403364_v4_n3_p931_Angelome |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Anisotropic particles Ascorbic acids Biosensing Cetyl trimethyl ammonium bromides Gold Nanoparticles Growth process In-situ Initial shape Mesoporous films Mesoporous oxides Mesoporous Silica Mesoporous silica thin films Metallic nanoparticles Reaction parameters Seeded growth Well-covered Composite materials Gold Ketones Metallic compounds Monolayers Nanoparticles Optical properties Organic acids Surface active agents Thin films Film growth |
| spellingShingle |
Anisotropic particles Ascorbic acids Biosensing Cetyl trimethyl ammonium bromides Gold Nanoparticles Growth process In-situ Initial shape Mesoporous films Mesoporous oxides Mesoporous Silica Mesoporous silica thin films Metallic nanoparticles Reaction parameters Seeded growth Well-covered Composite materials Gold Ketones Metallic compounds Monolayers Nanoparticles Optical properties Organic acids Surface active agents Thin films Film growth Growth and branching of gold nanoparticles through mesoporous silica thin films |
| topic_facet |
Anisotropic particles Ascorbic acids Biosensing Cetyl trimethyl ammonium bromides Gold Nanoparticles Growth process In-situ Initial shape Mesoporous films Mesoporous oxides Mesoporous Silica Mesoporous silica thin films Metallic nanoparticles Reaction parameters Seeded growth Well-covered Composite materials Gold Ketones Metallic compounds Monolayers Nanoparticles Optical properties Organic acids Surface active agents Thin films Film growth |
| description |
Composite materials made of mesoporous oxide thin films containing metallic nanoparticles are of high interest in various fields, including catalysis, biosensing and non-linear optics. We demonstrate in this work the fabrication of such composite materials containing a sub-monolayer of gold nanoparticles (GNPs) of various shapes covered with mesoporous silica thin films. Additionally, the shape of the GNPs (and thus their optical properties) can be modified in situ through seeded growth and branching. Such growth proceeds upon wetting with HAuCl 4 solution, a surfactant (cetyltrimethylammonium bromide, CTAB) and a mild reducing agent (ascorbic acid, AA). The effect of varying several reaction parameters (time and CTAB and AA concentrations) was evaluated, showing that more anisotropic particles are obtained at longer reaction times, lower CTAB concentration and higher AA concentration. The final shape of the GNPs was also found to depend on their initial shape and size, as well as the pore size of the mesoporous film covering them. Because the growth proceeds through the pores of the film, it may lead to shapes that are not easily obtained in solution, such as particles with branches on one side only. Finally, we have confirmed that no damage was induced to the mesoporous silica structure during the growth process and thus the final particles remain well covered by the thin film, which can eventually be used as a filter between the GNPs and the outer medium. © 2012 The Royal Society of Chemistry. |
| title |
Growth and branching of gold nanoparticles through mesoporous silica thin films |
| title_short |
Growth and branching of gold nanoparticles through mesoporous silica thin films |
| title_full |
Growth and branching of gold nanoparticles through mesoporous silica thin films |
| title_fullStr |
Growth and branching of gold nanoparticles through mesoporous silica thin films |
| title_full_unstemmed |
Growth and branching of gold nanoparticles through mesoporous silica thin films |
| title_sort |
growth and branching of gold nanoparticles through mesoporous silica thin films |
| publishDate |
2012 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_20403364_v4_n3_p931_Angelome http://hdl.handle.net/20.500.12110/paper_20403364_v4_n3_p931_Angelome |
| _version_ |
1768542243706109952 |