Low-Cost Gas Sensors Produced by the Graphite Line-Patterning Technique Applied to Monitoring Banana Ripeness

Autor(es)

Manzoli, Alexandra ^[1] ; Steffens, Clarice ^[1] ; Paschoalin, Rafaella T. ^[1] ; Correa, Alessandra A. ^[2] ; Alves, William F. ^{[1, 3]} ; Leite, Fabio L. ^[4] ; Herrmann, Paulo S. P. ^[1]

Afiliação do(s) autor(es)

^[1] Natl Nanotechnol Lab Agribusiness LNNA, Embrapa Instrumentat, BR-13560970 Sao Carlos, SP - Brazil

^[2] Fed Univ ABC UFABC, Ctr Engn Modeling & Appl Social Sci CECS, BR-09210170 Santo Andre, SP - Brazil

^[3] Fed Univ Acre UFAC, Ctr Multidisciplinary, BR-69915900 Cruzeiro Do Sul, AC - Brazil

^[4] Fed Univ Sao Carlos UFSCar, Dept Phys Math & Chem DFMQ, BR-18052780 Sorocaba, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: SENSORS; v. 11, n. 6, p. 6425-6434, JUN 2011.
• Citações Web of Science: 30

Resumo

A low-cost sensor array system for banana ripeness monitoring is presented. The sensors are constructed by employing a graphite line-patterning technique (LPT) to print interdigitated graphite electrodes on tracing paper and then coating the printed area with a thin film of polyaniline (PANI) by in-situ polymerization as the gas-sensitive layer. The PANI layers were used for the detection of volatile organic compounds (VOCs), including ethylene, emitted during ripening. The influence of the various acid dopants, hydrochloric acid (HCl), methanesulfonic acid (MSA), p-toluenesulfonic acid (TSA) and camphorsulfonic acid (CSA), on the electrical properties of the thin film of PANI adsorbed on the electrodes was also studied. The extent of doping of the films was investigated by UV-Vis absorption spectroscopy and tests showed that the type of dopant plays an important role in the performance of these low-cost sensors. The array of three sensors, without the PANI-HCl sensor, was able to produce a distinct pattern of signals, taken as a signature (fingerprint) that can be used to characterize bananas ripeness. (AU)

• Processo FAPESP: 10/04188-6 - Estudo toxicológico da nanopartícula de grafite magnético utilizando modelo de úberes bovinos
• Beneficiário: Rafaella Takehara Paschoalin
• Linha de fomento: Bolsas no Brasil - Mestrado
• Processo FAPESP: 08/57862-6 - NAMITEC
• Beneficiário: Jacobus Willibrordus Swart
• Linha de fomento: Auxílio à Pesquisa - Temático
• Processo FAPESP: 09/08244-0 - Desenvolvimento de microcantilever funcionalizado com polímeros condutores para a detecção de vapores químicos
• Beneficiário: Clarice Steffens
• Linha de fomento: Bolsas no Brasil - Doutorado