Single- and double-thread activated carbon fibers for pH sensing

被引:10
作者
Ahmed, Naser M. [1 ]
Sabah, Fayroz A. [1 ]
Kabaa, E. A. [1 ]
Myint, Myo Tay Zar [2 ]
机构
[1] Univ Sains Malaysia, Sch Phys, Usm 11800, Penang, Malaysia
[2] Sultan Qaboos Univ, Dept Phys, Coll Sci, POB 36, Muscat 123, Oman
关键词
Activated carbon; Single-and-double-thread; EGFET; pH sensor; Hysteresis; FIELD-EFFECT TRANSISTOR; OXIDE THIN-FILM; SIGNIFICANTLY BOOST; DOUBLE-LAYER; ZINC-OXIDE; SENSITIVITY; ADSORPTION; CLOTH; WATER; DESALINATION;
D O I
10.1016/j.matchemphys.2018.09.059
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
In this paper, activated carbon (AC) in the form of single and double threads is used for the first time as a pH sensor because of its intrinsic properties (high porosity, and conductivity). To determine its applicability as a pH sensor, this study characterizes the morphological features and measures the pH sensing characteristics of the AC threads. The pH sensing characteristics (sensitivity and hysteresis) of both single and double thread are: 19.66 mV/pH; 60.4 mV and 11.3 mV/pH; 144.6 mV, respectively. The AC single-thread exhibits a higher sensitivity for pH range of 2-12 with excellent linearity of 98.2%, and the lower hysteresis for pH (7-4-7-10-7) cycle. These values of pH sensitivity and hysteresis for AC single-thread make it a good EGFET candidate for use as a pH sensor. The high porosity and conductivity of the AC sensor explains its high pH sensing performance. Given the dependence of pH sensitivity on the ion-exchange between available [H+] in the electrolyte and the carbon ions available in the surface of the thread.
引用
收藏
页码:288 / 294
页数:7
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