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Nucciarelli F, Bravo I, Catalan-Gomez S, Vázquez L, Lorenzo E, Pau JL. High Ultraviolet Absorption in Colloidal Gallium Nanoparticles Prepared from Thermal Evaporation. Nanomaterials (Basel) 2017; 7:nano7070172. [PMID: 28684687 PMCID: PMC5535238 DOI: 10.3390/nano7070172] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/09/2017] [Revised: 06/26/2017] [Accepted: 06/30/2017] [Indexed: 11/16/2022]
Abstract
New methods for the production of colloidal Ga nanoparticles (GaNPs) are introduced based on the evaporation of gallium on expendable aluminum zinc oxide (AZO) layer. The nanoparticles can be prepared in aqueous or organic solvents such as tetrahydrofuran in order to be used in different sensing applications. The particles had a quasi mono-modal distribution with diameters ranging from 10 nm to 80 nm, and their aggregation status depended on the solvent nature. Compared to common chemical synthesis, our method assures higher yield with the possibility of tailoring particles size by adjusting the deposition time. The GaNPs have been studied by spectrophotometry to obtain the absorption spectra. The colloidal solutions exhibit strong plasmonic absorption in the ultra violet (UV) region around 280 nm, whose width and intensity mainly depend on the nanoparticles dimensions and their aggregation state. With regard to the colloidal GaNPs flocculate behavior, the water solvent case has been investigated for different pH values, showing UV-visible absorption because of the formation of NPs clusters. Using discrete dipole approximation (DDA) method simulations, a close connection between the UV absorption and NPs with a diameter smaller than ~40 nm was observed.
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Affiliation(s)
- Flavio Nucciarelli
- Physics Department, Lancaster University, Lancaster LA1 4YB, UK.
- Grupo de Electrónica y Semiconductores, Departamento de Física Aplicada, Universida Autónoma de Madrid, 28049 Madrid, Spain.
| | - Iria Bravo
- Departamento de Química Analítica y Análisis Instrumental, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain.
- Instituto Madrileño de Estudios Avanzados en Nanociencia (IMDEA-Nanociencia), Faraday, 9, Campus UAM, Cantoblanco, 28049 Madrid, Spain.
| | - Sergio Catalan-Gomez
- Grupo de Electrónica y Semiconductores, Departamento de Física Aplicada, Universida Autónoma de Madrid, 28049 Madrid, Spain.
| | - Luis Vázquez
- Materials Science Factory, Instituto de Ciencia de Materiales de Madrid, CSIC, 28049 Madrid, Spain.
| | - Encarnación Lorenzo
- Departamento de Química Analítica y Análisis Instrumental, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain.
- Instituto Madrileño de Estudios Avanzados en Nanociencia (IMDEA-Nanociencia), Faraday, 9, Campus UAM, Cantoblanco, 28049 Madrid, Spain.
- Institute for Advanced Research in Chemical Sciences (IAdChem), Universidad Autónoma de Madrid, 28049 Madrid, Spain.
| | - Jose Luis Pau
- Grupo de Electrónica y Semiconductores, Departamento de Física Aplicada, Universida Autónoma de Madrid, 28049 Madrid, Spain.
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