Gold Nanoparticle Self-Aggregation on Surface with 1,6-Hexanedithiol Functionalization
Here we study the morphology and the optical properties of assemblies made of small (17 nm) gold nanoparticles (AuNPs) directly on silicon wafers coated with (3-aminopropyl)trimethoxysilane (APTES). We employed aliphatic 1,6-hexanedithiol (HDT) molecules to cross-link AuNPs during a two-stage precip...
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MDPI AG
2020-03-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/10/3/512 |
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| author | Maksym Stetsenko Tetiana Margitych Serhii Kryvyi Lidia Maksimenko Ali Hassan Svitlana Filonenko Βaikui Li Junle Qu Elke Scheer Sergii Snegir |
| author_facet | Maksym Stetsenko Tetiana Margitych Serhii Kryvyi Lidia Maksimenko Ali Hassan Svitlana Filonenko Βaikui Li Junle Qu Elke Scheer Sergii Snegir |
| author_sort | Maksym Stetsenko |
| collection | DOAJ |
| description | Here we study the morphology and the optical properties of assemblies made of small (17 nm) gold nanoparticles (AuNPs) directly on silicon wafers coated with (3-aminopropyl)trimethoxysilane (APTES). We employed aliphatic 1,6-hexanedithiol (HDT) molecules to cross-link AuNPs during a two-stage precipitation procedure. The first immersion of the wafer in AuNP colloidal solution led mainly to the attachment of single particles with few inclusions of dimers and small aggregates. After the functionalization of precipitated NPs with HDT and after the second immersion in the colloidal solution of AuNP, we detected a sharp rise in the number of aggregates compared to single AuNPs and their dimers. The lateral size of the aggregates was about 100 nm, while some of them were larger than 1μm. We propose that the uncompensated dipole moment of the small aggregates appeared after the first precipitation and acts further as the driving force accelerating their further growth on the surface during the second precipitation. By having such inhomogeneous surface coating, the X-ray reciprocal space maps and modulation polarimetry showed well-distinguished signals from the single AuNPs and their dimers. From these observations, we concluded that the contribution from aggregated AuNPs does not hamper the detection and investigation of plasmonic effects for AuNP dimers. Meantime, using unpolarized and polarized light spectroscopy, the difference in the optical signals between the dimers, being formed because of self-aggregation and the one being cross-linked by means of HDT, was not detected. |
| first_indexed | 2024-12-11T22:31:43Z |
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| language | English |
| last_indexed | 2024-12-11T22:31:43Z |
| publishDate | 2020-03-01 |
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| record_format | Article |
| series | Nanomaterials |
| spelling | doaj.art-131b55f607f949e98c8fb8d2128b36a02022-12-22T00:48:07ZengMDPI AGNanomaterials2079-49912020-03-0110351210.3390/nano10030512nano10030512Gold Nanoparticle Self-Aggregation on Surface with 1,6-Hexanedithiol FunctionalizationMaksym Stetsenko0Tetiana Margitych1Serhii Kryvyi2Lidia Maksimenko3Ali Hassan4Svitlana Filonenko5Βaikui Li6Junle Qu7Elke Scheer8Sergii Snegir9Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, ChinaKyiv Institute for Nuclear Research, National Academy of Sciences of Ukraine, 03680 Kyiv, UkraineV. Lashkaryov Institute of Semiconductor Physics, National Academy of Sciences of Ukraine, 03680 Kyiv, UkraineV. Lashkaryov Institute of Semiconductor Physics, National Academy of Sciences of Ukraine, 03680 Kyiv, UkraineKey Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, ChinaPisarzhevski Institute of Physical Chemistry, National Academy of Sciences of Ukraine, 31 Prospect Nauky, 03028 Kiev, UkraineKey Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, ChinaKey Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, ChinaUniversity of Konstanz, Department of Physics, Universitätsstraße 10, 78464 Konstanz, GermanyUniversity of Konstanz, Department of Physics, Universitätsstraße 10, 78464 Konstanz, GermanyHere we study the morphology and the optical properties of assemblies made of small (17 nm) gold nanoparticles (AuNPs) directly on silicon wafers coated with (3-aminopropyl)trimethoxysilane (APTES). We employed aliphatic 1,6-hexanedithiol (HDT) molecules to cross-link AuNPs during a two-stage precipitation procedure. The first immersion of the wafer in AuNP colloidal solution led mainly to the attachment of single particles with few inclusions of dimers and small aggregates. After the functionalization of precipitated NPs with HDT and after the second immersion in the colloidal solution of AuNP, we detected a sharp rise in the number of aggregates compared to single AuNPs and their dimers. The lateral size of the aggregates was about 100 nm, while some of them were larger than 1μm. We propose that the uncompensated dipole moment of the small aggregates appeared after the first precipitation and acts further as the driving force accelerating their further growth on the surface during the second precipitation. By having such inhomogeneous surface coating, the X-ray reciprocal space maps and modulation polarimetry showed well-distinguished signals from the single AuNPs and their dimers. From these observations, we concluded that the contribution from aggregated AuNPs does not hamper the detection and investigation of plasmonic effects for AuNP dimers. Meantime, using unpolarized and polarized light spectroscopy, the difference in the optical signals between the dimers, being formed because of self-aggregation and the one being cross-linked by means of HDT, was not detected.https://www.mdpi.com/2079-4991/10/3/512aggregationdimersaunpsself-assemblysurface1,6-hexanedithiolaptesopticsmorphology |
| spellingShingle | Maksym Stetsenko Tetiana Margitych Serhii Kryvyi Lidia Maksimenko Ali Hassan Svitlana Filonenko Βaikui Li Junle Qu Elke Scheer Sergii Snegir Gold Nanoparticle Self-Aggregation on Surface with 1,6-Hexanedithiol Functionalization Nanomaterials aggregation dimers aunps self-assembly surface 1,6-hexanedithiol aptes optics morphology |
| title | Gold Nanoparticle Self-Aggregation on Surface with 1,6-Hexanedithiol Functionalization |
| title_full | Gold Nanoparticle Self-Aggregation on Surface with 1,6-Hexanedithiol Functionalization |
| title_fullStr | Gold Nanoparticle Self-Aggregation on Surface with 1,6-Hexanedithiol Functionalization |
| title_full_unstemmed | Gold Nanoparticle Self-Aggregation on Surface with 1,6-Hexanedithiol Functionalization |
| title_short | Gold Nanoparticle Self-Aggregation on Surface with 1,6-Hexanedithiol Functionalization |
| title_sort | gold nanoparticle self aggregation on surface with 1 6 hexanedithiol functionalization |
| topic | aggregation dimers aunps self-assembly surface 1,6-hexanedithiol aptes optics morphology |
| url | https://www.mdpi.com/2079-4991/10/3/512 |
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