首页|In Vivo Voltammetric Imaging of Metal Nanoparticle-Catalyzed Single-Cell Electron Transfer by Fermi Level-Responsive Graphene
In Vivo Voltammetric Imaging of Metal Nanoparticle-Catalyzed Single-Cell Electron Transfer by Fermi Level-Responsive Graphene
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Metal nanomaterials can facilitate microbial extracellular electron transfer(EET)in the electrochemically active biofilm.However,the role of nanomaterials/bacteria interaction in this process is still unclear.Here,we reported the single-cell voltammetric imaging of Shewanella oneidensis MR-1 at the single-cell level to elucidate the metal-enhanced EET mechanism in vivo by the Fermi level-responsive graphene electrode.Quantified oxidation currents of～20 fA were observed from single native cells and gold nanoparticle(AuNP)-coated cells in linear sweep voltammetry analysis.On the contrary,the oxidation potential was reduced by up to 100 mV after AuNP modification.It revealed the mechanism of AuNP-catalyzed direct EET decreasing the oxidation barrier between the outer membrane cytochromes and the electrode.Our method offered a promising strategy to understand the nanomaterials/bacteria interaction and guide the rational construction of EET-related microbial fuel cells.
State Key Laboratory of Analytical Chemistry for Life Science,School of Chemistry and Chemical Engineering,Nanjing University,Nanjing 210023,P.R.China
Shenzhen Research Institute of Nanjing University,Shenzhen 518000,P.R.China
国家自然科学基金国家自然科学基金国家自然科学基金江苏省自然科学基金Guangdong Basic and Applied Basic Research FoundationFunds for Central Guided Regional Science and Technology Development中央高校基本科研业务费专项
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