Conductometric graphene sensors decorated with nanoclusters for selective detection of Hg2+ traces in water

被引：51
作者：
Ayesh, Ahmad I. [1 ]
Karam, Zainab [2 ]
Awwad, Falah [3 ]
Meetani, Mohammed A. [4 ]
机构：
[1] Qatar Univ, Dept Math Stat & Phys, Doha, Qatar
[2] Masdar Inst, Abu Dhabi, U Arab Emirates
[3] United Arab Emirates Univ, Dept Elect Engn, Al Ain, U Arab Emirates
[4] United Arab Emirates Univ, Dept Chem, Al Ain, U Arab Emirates
来源：
SENSORS AND ACTUATORS B-CHEMICAL | 2015年 / 221卷
关键词：
Graphene; Gold nanoclusters; Mercury sensor; Inert-gas condensation; CARBON NANOTUBE; METAL-IONS; MERCURY; BINDING; ENERGY; LEAD; PD;
D O I：
10.1016/j.snb.2015.06.075
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
Mercury ion (Hg2+) sensors based on graphene and gold nanoclusters are presented in this work. The sensors follow the structure of field-effect transistor (FET), and their sensing mechanism relies on the change in conductance of graphene and gold nanocluster percolating film. Each sensor was fabricated by deposition of interdigitated metal electrodes on the surface of graphene by thermal evaporation through a shadow mask. Next, gold nanoclusters are generated by magnetron discharge sputtering and inert-gas condensation inside an ultra-high compatible system, and they are self-assembled on the surface of graphene. The sensitivity and selectivity of graphene to Hg2+ are vastly enhanced by incorporating the nanoclusters on its surface. The detection limit of the present sensors is below the safe concentration of Hg2+ in drinking water set by different universal agencies. In addition, those sensors are practical and easy to operate in field for real life applications. (C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码：201 / 206
页数：6
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