Porous Graphene Oxide Films Prepared via the Breath-Figure Method: A Simple Strategy for Switching Access of Redox Species to an Electrode Surface

Autor(es)

Cheng, Rumei ^[1] ; Colombo, Rafael N. P. ^[2] ; Zhang, Long ^[3] ; Nguyen, Duyen H. T. ^[3] ; Tilley, Richard ^[3] ; Cordoba de Torresi, I, Susana ; Dai, Liming ^[4] ; Gooding, J. Justin ^[3] ; Goncales, Vinicius R. ^[3]

Afiliação do(s) autor(es)

^[1] Wenzhou Med Univ, Sch Ophthalmol & Optometry, Sch Biomed Engn, Wenzhou 325027, Zhejiang - Peoples R China

^[2] I, Univ Sao Paulo, Inst Quim, BR-05508000 Sao Paulo - Brazil

^[3] Univ New South Wales, Sch Chem, Australia Ctr NanoMed, ARC Ctr Excellence Convergent Bionano Sci & Techn, Sydney, NSW 2052 - Australia

^[4] Univ New South Wales, Sch Chem Engn, Sydney, NSW 2052 - Australia

• Tipo de documento: Artigo Científico
• Fonte: ACS APPLIED MATERIALS & INTERFACES; v. 12, n. 49, p. 55181-55188, DEC 9 2020.
• Citações Web of Science: 0

Resumo

Porous materials can be modified with physical barriers to control the transport of ions and molecules through channels via an external stimulus. Such capability has brought attention toward drug delivery, separation methods, nanofluidics, and point-of-care devices. In this context, gated platforms on which access to an electrode surface of species in solution can be reversibly hindered/unhindered on demand are appearing as promising materials for sensing and microfluidic switches. The preparation of a reversible gated device usually requires mesoporous materials, nanopores, or molecularly imprinted polymers. Here, we show how the breath-figure method assembly of graphene oxide can be used as a simple strategy to produce gated electrochemical materials. This was achieved by forming an organized porous thin film of graphene oxide onto an ITO surface. Localized brushes of thermoresponsive poly(N-isopropylacrylamide) were then grown to specific sites of the porous film by in situ reversible addition-fragmentation chain-transfer polymerization. The gating mechanism relies on the polymeric chains to expand and contract depending on the thermal stimulus, thus modulating the accessibility of redox species inside the pores. The resulting platform was shown to reversibly hinder or facilitate the electron transfer of solution redox species by modulating temperature from the room value to 45 degrees C or vice versa. (AU)

• Processo FAPESP: 18/10930-9 - Design de nano-sistemas multi-metálicos para sensores ópticos
• Beneficiário: Rafael Neri Prystaj Colombo
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Doutorado Direto
• Processo FAPESP: 15/26308-7 - Otimização das propriedades físico-químicas de materiais nano-estruturados e suas aplicações em reconhecimento molecular, catálise e conversão/armazenamento de energia
• Beneficiário: Roberto Manuel Torresi
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 17/50264-5 - Design of multi-metal nanoarrays for optical sensors
• Beneficiário: Susana Inés Córdoba de Torresi
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 15/12786-4 - Superfícies micro e nanoestruturadas via eletroquímica: da morfologia às propriedades
• Beneficiário: Rafael Neri Prystaj Colombo
• Modalidade de apoio: Bolsas no Brasil - Doutorado Direto