Fast electrical detection of Hg(II) ions with AlGaN/GaN high electron mobility transistors Academic Article uri icon

abstract

  • Bare Au gated and thioglycolic acid functionalized Au-gated AlGaNGaN high electron mobility transistors (HEMTs) were used to detect mercury (II) ions. Fast detection of less than 5s was achieved for thioglycolic acid functionalized sensors. This is the shortest response time ever reported for mercury detection. Thioglycolic acid functionalized Au-gated AlGaNGaN HEMT based sensors showed 2.5 times larger response than bare Au-gated based sensors. The sensors were able to detect mercury (II) ion concentration as low as 107M. The sensors showed an excellent sensing selectivity of more than 100 for detecting mercury ions over sodium or magnesium ions. The dimensions of the active area of the sensor and the entire sensor chip are 5050m2 and 15mm2, respectively. Therefore, portable, fast response, and wireless based heavy metal ion detectors can be realized with AlGaNGaN HEMT based sensors.

published proceedings

  • APPLIED PHYSICS LETTERS

author list (cited authors)

  • Wang, H., Kang, B. S., Chancellor, T., Lele, T. P., Tseng, Y., Ren, F., ... Linthicum, K. J.

citation count

  • 81

complete list of authors

  • Wang, Hung-Ta||Kang, BS||Chancellor, TF Jr||Lele, TP||Tseng, Y||Ren, F||Pearton, SJ||Johnson, WJ||Rajagopal, P||Roberts, JC||Piner, EL||Linthicum, KJ

publication date

  • July 2007