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Faraco TA, Yoshioka NA, Sábio RM, Barud HDS, Maciel IO, Quirino WG, Fragneaud B, Aguiar AMD, Ribeiro SJL, Cremona M, Legnani C. Monolayer of silica nanospheres assembled onto ITO-coated glass substrates by spin-coating. NANOTECHNOLOGY 2021; 32:205603. [PMID: 33567416 DOI: 10.1088/1361-6528/abe4fd] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
In this work, we synthesized colloidal silica nanospheres with an average size of 400 nm through the modified Stöber method and successfully fabricated an ordered close-packed silica nanosphere monolayer onto ITO-coated glass substrates using a three-step spin-coating method. ITO films showed resistivity comparable to that of commercial ITO and the silica nanosphere monolayer-coated ITO/glass substrate exhibited good optical transmittance in the visible (550 nm) and near-infrared (900 nm) regions of 62% and 82%, respectively. The results suggest that this monolayer can be used in optoelectronic devices to enhance efficiency in photovoltaic cells.
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Affiliation(s)
- T A Faraco
- Grupo de Nanociência e Nanotecnologia (NANO), Departamento de Física, Universidade Federal de Juiz de Fora (UFJF), Juiz de Fora, MG, 36036-330, Brasil
- Laboratório de Optoeletrônica Molecular (LOEM), Departamento de Física, Pontifícia Universidade Católica do Rio de Janeiro (PUC-Rio), Rio de Janeiro, RJ, 22453-970, Brasil
| | - N A Yoshioka
- Grupo de Nanociência e Nanotecnologia (NANO), Departamento de Física, Universidade Federal de Juiz de Fora (UFJF), Juiz de Fora, MG, 36036-330, Brasil
| | - R M Sábio
- Faculdade de Ciências Farmacêuticas, Universidade Estatual Paulista Júlio de Mesquita Filho (UNESP), Araraquara, SP, 14800-903, Brasil
| | - H da S Barud
- Laboratório de Biopolímeros e Biomateriais (BIOPOLMAT), Departamento de Biotecnologia, Universidade de Araraquara (UNIARA), Araraquara, SP, 14801-340, Brasil
| | - I O Maciel
- Grupo de Nanociência e Nanotecnologia (NANO), Departamento de Física, Universidade Federal de Juiz de Fora (UFJF), Juiz de Fora, MG, 36036-330, Brasil
| | - W G Quirino
- Grupo de Nanociência e Nanotecnologia (NANO), Departamento de Física, Universidade Federal de Juiz de Fora (UFJF), Juiz de Fora, MG, 36036-330, Brasil
| | - B Fragneaud
- Grupo de Nanociência e Nanotecnologia (NANO), Departamento de Física, Universidade Federal de Juiz de Fora (UFJF), Juiz de Fora, MG, 36036-330, Brasil
| | - A M de Aguiar
- Departamento de Física, Universidade Federal de Juiz de Fora (UFJF), Juiz de Fora, MG, 36036-330, Brasil
| | - S J L Ribeiro
- Institudo de Química, Universidade Estatual Paulista Júlio de Mesquita Filho (UNESP), Araraquara, SP, 14801-970, Brasil
| | - M Cremona
- Laboratório de Optoeletrônica Molecular (LOEM), Departamento de Física, Pontifícia Universidade Católica do Rio de Janeiro (PUC-Rio), Rio de Janeiro, RJ, 22453-970, Brasil
| | - C Legnani
- Grupo de Nanociência e Nanotecnologia (NANO), Departamento de Física, Universidade Federal de Juiz de Fora (UFJF), Juiz de Fora, MG, 36036-330, Brasil
- Institudo de Química, Universidade Estatual Paulista Júlio de Mesquita Filho (UNESP), Araraquara, SP, 14801-970, Brasil
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Montes-García V, Squillaci MA, Diez-Castellnou M, Ong QK, Stellacci F, Samorì P. Chemical sensing with Au and Ag nanoparticles. Chem Soc Rev 2021; 50:1269-1304. [PMID: 33290474 DOI: 10.1039/d0cs01112f] [Citation(s) in RCA: 55] [Impact Index Per Article: 18.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Noble metal nanoparticles (NPs) are ideal scaffolds for the fabrication of sensing devices because of their high surface-to-volume ratio combined with their unique optical and electrical properties which are extremely sensitive to changes in the environment. Such characteristics guarantee high sensitivity in sensing processes. Metal NPs can be decorated with ad hoc molecular building blocks which can act as receptors of specific analytes. By pursuing this strategy, and by taking full advantage of the specificity of supramolecular recognition events, highly selective sensing devices can be fabricated. Besides, noble metal NPs can also be a pivotal element for the fabrication of chemical nose/tongue sensors to target complex mixtures of analytes. This review highlights the most enlightening strategies developed during the last decade, towards the fabrication of chemical sensors with either optical or electrical readout combining high sensitivity and selectivity, along with fast response and full reversibility, with special attention to approaches that enable efficient environmental and health monitoring.
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Affiliation(s)
- Verónica Montes-García
- University of Strasbourg, CNRS, ISIS UMR 7006, 8 Allée Gaspard Monge, F-67000 Strasbourg, France.
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