Autor(es)

Congiu, Mirko ^[1] ; Boratto, Miguel H. ^[2] ; Graeff, Carlos F. O. ^[3]

Afiliação do(s) autor(es)

^[1] UNESP Sao Paulo State Univ, Sch Sci, POSMAT Postgrad Program Mat Sci & Technol, Av Eng Luiz Edmundo Carrijo Coube 14-01, BR-17033360 Bauru, SP - Brazil

^[2] Fed Univ Santa Catarina UFSC, Dept Phys, Postgrad Program Phys, BR-88040900 Florianopolis, SC - Brazil

^[3] UNESP Sao Paulo State Univ, Sch Sci, Dept Phys, Av Eng Luiz Edmundo Carrijo Coube 14-01, BR-17033360 Bauru, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: CHEMISTRYSELECT; v. 3, n. 34, p. 9794-9802, SEP 14 2018.
• Citações Web of Science: 4

Resumo

Neuromorphic hardware systems that simulate functions of biological brain synapses have been widely investigated due to their possible application in brain-inspired computing. We hereby report on a novel electrochemical state machine based on Zn:CdS thin films. The memory switching mechanism involves the cation exchange of Cu2+ and Zn2+ acting as inorganic ``neurotransmitters{''}. Similarly to the synapse-neuro- transmitter interactions, Cu2+ ions increase the conductivity and the electrocatalytic activity of Zn:CdS towards the ferrocene/ferrocenium redox process. The cationic substitution of Zn2+ by Cu2+ in the film has shown significant changes in the electrochemical characteristic of the device. Such effects have been investigated with both alternated current (impedance) and direct current (voltammetry and I vs V) measurements. The cation exchange mechanism allows to write and store an electrochemical information into the device. Such information can be gradually erased by exchanging the absorbed Cu2+ ions with Zn2+. By means of a timed soaking, of the active area, with Cu2+ and Zn2+ diethyldithiocarbamates, the device can be driven through multiple conduction states, making it suitable for applications in artificial synapses research and memory storage systems. (AU)

• Processo FAPESP: 16/17302-8 - Fabricação de memórias ReRAM a base de filmes finos de CuxS e COS
• Beneficiário: Mirko Congiu
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 13/25028-5 - Avaliação global e otimização de células sensibilizadas e híbridas
• Beneficiário: Carlos Frederico de Oliveira Graeff
• Modalidade de apoio: Auxílio à Pesquisa - Pesquisador Visitante - Internacional
• Processo FAPESP: 08/57872-1 - Instituto Nacional de Ciências dos Materiais em Nanotecnologia
• Beneficiário: Elson Longo da Silva
• Modalidade de apoio: Auxílio à Pesquisa - Temático