Femtosecond laser ablation of gold interdigitated electrodes for electronic tongues

Autor(es)

Manzoli, Alexandra ^[1] ; de Almeida, Gustavo F. B. ^[2] ; Filho, Jose A. ^[1] ; Mattoso, Luiz H. C. ^[1] ; Riul, Jr., Antonio ^[3] ; Mendonca, Cleber R. ^[2] ; Correa, Daniel S. ^[1]

Afiliação do(s) autor(es)

^[1] Embrapa Instrumentacao, LNNA, BR-13560970 Sao Carlos, SP - Brazil

^[2] Univ Sao Paulo, Inst Fis Sao Carlos, BR-13560970 Sao Carlos, SP - Brazil

^[3] Univ Estadual Campinas, Inst Fis Gleb Wataghin, BR-13083859 Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: OPTICS AND LASER TECHNOLOGY; v. 69, p. 148-153, JUN 2015.
• Citações Web of Science: 6

Resumo

Electronic tongue (e-tongue) sensors based on impedance spectroscopy have emerged as a potential technology to evaluate the quality and chemical composition of food, beverages, and pharmaceuticals. E-tongues usually employ transducers based on metal interdigitated electrodes (IDEs) coated with a thin layer of an active material, which is capable of interacting chemically with several types of analytes. IDEs are usually produced by photolithographic methods, which are time-consuming and costly, therefore, new fabrication technologies are required to make it more affordable. Here, we employed femtosecond laser ablation with pulse duration of 50 fs to microfabricate gold IDEs having finger width from 2.3 mu m up to 3.2 mu m. The parameters used in the laser ablation technique, such as light intensity, scan speed and beam spot size have been optimized to achieve uniform IDEs, which were characterized by optical and scanning electron microscopy. The electrical properties of gold IDEs fabricated by laser ablation were evaluated by impedance spectroscopy, and compared to those produced by conventional photolithography. The results show that femtosecond laser ablation is a promising alternative to conventional photolithography for fabricating metal IDEs for e-tongue systems. (C) 2014 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 11/12399-0 - Aplicações de pulsos de femtossegundos em óptica não linear: espectroscopia, formatação de pulsos e microfabricação
• Beneficiário: Cleber Renato Mendonça
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 14/16789-5 - Materiais nanoestruturados híbridos baseados em polímeros conjugados e partículas metálicas aplicados em sensores
• Beneficiário: Daniel Souza Corrêa
• Modalidade de apoio: Auxílio à Pesquisa - Regular