Ultrahigh-Gain Organic Electrochemical Transistor Chemosensors Based on Self-Curled Nanomembranes

Author(s)

Ferro, Leticia M. M. ^{[1, 2]} ; Merces, Leandro ^[1] ; de Camargo, Davi H. S. ^[1] ; Bufon, Carlos C. B. ^{[3, 1, 2]}

Affiliation

^[1] Brazilian Ctr Res Energy & Mat CNPEM, Brazilian Nanotechnol Natl Lab LNNano, Giuseppe Maximo Scolfaro 10000, Polo 2 Alta Tecnol, BR-13083100 Campinas - Brazil

^[2] Univ Estadual Campinas, UNICAMP, Inst Chem IQ, Cidade Univ Zeferino Vaz, BR-13083970 Campinas - Brazil

^[3] Sao Paulo State Univ UNESP, Postgrad Program Mat Sci & Technol POSMAT, BR-17033360 Bauru, SP - Brazil

• Document type: Journal article
• Source: Advanced Materials; v. 33, n. 29 JUL 2021.
• Web of Science Citations: 0

Abstract

Organic electrochemical transistors (OECTs) are technologically relevant devices presenting high susceptibility to physical stimulus, chemical functionalization, and shape changes-jointly to versatility and low production costs. The OECT capability of liquid-gating addresses both electrochemical sensing and signal amplification within a single integrated device unit. However, given the organic semiconductor time-consuming doping process and their usual low field-effect mobility, OECTs are frequently considered low-end category devices. Toward high-performance OECTs, microtubular electrochemical devices based on strain-engineering are presented here by taking advantage of the exclusive shape features of self-curled nanomembranes. Such novel OECTs outperform the state-of-the-art organic liquid-gated transistors, reaching lower operating voltage, improved ion doping, and a signal amplification with a >10(4) intrinsic gain. The multipurpose OECT concept is validated with different electrolytes and distinct nanometer-thick molecular films, namely, phthalocyanine and thiophene derivatives. The OECTs are also applied as transducers to detect a biomarker related to neurological diseases, the neurotransmitter dopamine. The self-curled OECTs update the premises of electrochemical energy conversion in liquid-gated transistors, yielding a substantial performance improvement and new chemical sensing capabilities within picoliter sampling volumes. (AU)

• FAPESP's process: 14/25979-2 - Fabrication and characterization of devices and systems based on hybrid nanomembranes
• Grantee: Carlos César Bof Bufon
• Support Opportunities: Research Grants - Young Investigators Grants
• FAPESP's process: 13/22127-2 - Development of novel materials strategic for integrated analytical devices
• Grantee: Lauro Tatsuo Kubota
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 14/50906-9 - INCT 2014: in Functional Complex Materials
• Grantee: Fernando Galembeck
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 18/18136-0 - Hybrid nanodevices: magnetoelectronic transport and development of sensors based on molecules/nanomembranes
• Grantee: Leandro das Mercês Silva
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 17/21117-4 - Development and characterization of nanomembrane-based electrochemical cells for biosensor application
• Grantee: Letícia Mariê Minatogau Ferro
• Support Opportunities: Scholarships in Brazil - Doctorate