An ultrasensitive micro sensor for the detection of trace lead (II) is fabricated by mixed dispersion solution of bismuth nanoparticles (Bi NPs) and PDDA, and layer-by-layer self-assembled (LBL SA) with graphene (G) suspension solution on a micro gold electrode. The LBL SA G-Bi NPs sensor performance has been greatly enhanced in determination of Pb (II) using anodic stripping voltammetry (ASV). Compared with a sensor without surface modification, the sensor's stripping peak potential decreased from -0.520 V to -0.564 V, and its peak current increased from 1.227 μA to 8.372 μA. Compared with a sensor modified by LBL SA G (without Bi NPs), stripping peak potential decreased from -0.548 V to -0.572 V, the sensor's peak current increased from 0.284 μA to 1.263 μA. This sensor's limit of detection (LOD) of Pb (II) was achieved as 0.078 ppb with a sensitivity of 1.061 μA/ppb. This simple but effective graphene-metal nanocomposites construction method can be widely used in the development of highly sensitive ion sensor.
|Original language||English (US)|
|Title of host publication||2017 IEEE 30th International Conference on Micro Electro Mechanical Systems, MEMS 2017|
|Publisher||Institute of Electrical and Electronics Engineers Inc.|
|Number of pages||4|
|State||Published - Feb 23 2017|
|Event||30th IEEE International Conference on Micro Electro Mechanical Systems, MEMS 2017 - Las Vegas, United States|
Duration: Jan 22 2017 → Jan 26 2017
|Name||Proceedings of the IEEE International Conference on Micro Electro Mechanical Systems (MEMS)|
|Other||30th IEEE International Conference on Micro Electro Mechanical Systems, MEMS 2017|
|Period||1/22/17 → 1/26/17|
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© 2017 IEEE.
Copyright 2017 Elsevier B.V., All rights reserved.