Silicon nanowire sensors for Hg2+ and Cd2+ ions

Linbao Luo; Jiansheng Jie; Wenfeng Zhang; Zhubing He; Jianxiong Wang; Guodong Yuan; Wenjun Zhang; Wu, Lawrence Chi Man; Shuit-Tong Lee
May 2009
Applied Physics Letters;5/11/2009, Vol. 94 Issue 19, p193101
Academic Journal
High-sensitivity detection of toxic heavy metal cations such as Hg2+ and Cd2+ ions was demonstrated using single silicon nanowire field-effect transistors (SiNW-FETs). The conduct-ance of FET fabricated from thermally oxidized SiNWs functionalized with 3-mercaptopropyltriethoxysilane showed high sensitivity to Hg2+ and Cd2+ ions at a concentration down to 10-7 and 10-4M, respectively. Linear relationship between the logarithmic concentration of metal ions and the current change was observed. The SiNW sensor could be recycled to regain nearly the same sensitivity. Comparative experiments showed that SiNW-FET sensors have great selectivity for detecting Hg2+ and Cd2+ over other metal cations.


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