Self-Standing Thin Films of Cellulose Nanocrystals and Graphene Quantum Dots for Detection of Trace Iron(III)

Autor(es)

Teodoro, Kelcilene B. R. ; Facure, Murilo H. M. ; Schneider, Rodrigo ; Alvarenga, Augusto D. ; Andre, Rafaela S. ; Correa, Daniel S.

• Tipo de documento: Artigo Científico
• Fonte: ACS APPLIED NANO MATERIALS; v. 6, n. 13, p. 11-pg., 2023-06-22.

Resumo

Cellulose nanocrystal (CNC) thin films have gained attentionforapplication in green optoelectronics devices. However, the dependenceon plasticizers, external cross-linkers, or auxiliary polymers canimpair the full exploration of the nanomaterials' properties.Herein, we report on the evaluation of a surface-oxidized CNCs ultrathinfilm, made from a formulation that excludes the use of auxiliary compounds,to be used as a sensing platform. The physicochemical characterizationsusing UV-vis, Fourier transform infrared , and Raman spectroscopies,nuclear magnetic resonance, zeta potential, transmission electronand field emission scanning electron microscopies, X-ray diffraction,thermogravimetric analysis, and contact angle measurement showed thatthe adopted procedure led to (i) the modification of the CNC surfaceand (ii) the formation of smaller CNCs. The production of castingfilms from highly diluted CNC-modified aqueous suspensions showedthat a very thin, transparent, self-supporting, and manipulable filmcould be obtained, which was not the case for diluted unmodified CNCsuspension. Additionally, the CNC thin film has been demonstratedto be a suitable platform for hosting graphene quantum dots, basedon which an optochemical sensor was successfully employed to detectiron(III) in a dynamic range from 1 fM to 2 pM, yielding a limit ofdetection of 0.8 fM. (AU)

• Processo FAPESP: 18/18468-2 - Metodologias de sínteses de nanoestruturas de dissulfeto de molibdênio (MoS2) e avaliação da sua potencial aplicação em sistemas de adsorção de poluentes
• Beneficiário: Rodrigo Schneider
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 17/10582-8 - Produção e caracterização de quantum dots de grafeno e sua aplicação em sensores químicos
• Beneficiário: Murilo Henrique Moreira Facure
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 18/22214-6 - Rumo à convergência de tecnologias: de sensores e biossensores à visualização de informação e aprendizado de máquina para análise de dados em diagnóstico clínico
• Beneficiário: Osvaldo Novais de Oliveira Junior
• Modalidade de apoio: Auxílio à Pesquisa - Temático