Field-Effect Transistor Based on Percolation Network of Reduced Graphene Oxide for Real-Time ppb-Level Detection of Lead Ions in Water | Zendy

Xiaoyu Sui | Zendy; Hongting Pu | Zendy; Arnab Maity | Zendy; Jingbo Chang | Zendy; Bing Jin | Zendy; Ganhua Lu | Zendy; Yale Wang | Zendy; Ren Ren | Zendy; Shun Mao | Zendy; Junhong Chen | Zendy

Open Access

Field-Effect Transistor Based on Percolation Network of Reduced Graphene Oxide for Real-Time ppb-Level Detection of Lead Ions in Water

Author(s) -

Xiaoyu Sui,

Hongting Pu,

Arnab Maity,

Jingbo Chang,

Bing Jin,

Ganhua Lu,

Yale Wang,

Ren Ren,

Shun Mao,

Junhong Chen

Publication year - 2020

Publication title -

ecs journal of solid state science and technology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.488

H-Index - 51

eISSN - 2162-8777

pISSN - 2162-8769

DOI - 10.1149/2162-8777/abaaf4

Subject(s) - materials science , graphene , oxide , detection limit , percolation (cognitive psychology) , ion , transistor , optoelectronics , percolation threshold , analyte , lead (geology) , percolation theory , analytical chemistry (journal) , nanotechnology , electrical resistivity and conductivity , conductivity , environmental chemistry , voltage , chromatography , chemistry , electrical engineering , metallurgy , geology , biology , organic chemistry , engineering , neuroscience , geomorphology

Real-time lead ion monitoring for drinking water is in an urgent demand, due to the high biotoxicity of lead. We fabricated a reduced graphene oxide (rGO) percolation network based field-effect transistor (FET) by using an easy and scalable micromolding-in-capillary method for lead ion detection in water. The percolation theory analysis elucidates that the required GO mass concentration for a 2D continuum connection converges at a predictable value. Guided by the theoretical analysis, the prepared rGO network was constructed with 1–4 layers of rGO flakes and exhibits comparable electrical properties with single-layer rGO devices. A thin Al 2 O 3 layer was deposited on the device to isolate the analyte from the FET device. With the specific L-Glutathione reduced (GSH) probe, the sensor can reach a limit of detection (LOD) in ppb-level to lead ions. In addition, good selectivity and the high sensing response to Pb 2+ concentrations around 15 ppb (maximum contaminant level of lead for drinking water, US Environmental Protection Agency) suggest our sensor holds great potential for lead ion monitoring in drinking water.

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