Investigation of Sensing Characteristic of Flexible Arrayed RuO2 Chlorine Ion Sensor Modified by Graphene Oxide

In this paper, the response time, interfering effect, drift effect, and hysteresis effect were investigated for the flexible arrayed ruthenium dioxide (RuO
₂
)/0.01 wt% graphene oxide (GO) chlorine ion sensor. The best response time was 2 s in 10
^-2
M and 1 M NaCl solutions. The KNO
₃
, CaSO
₄
, CaCO
₃
, K
₂
SO
₄
, NaHCO
₃
, and NaI solutions were dropped in 10
^-5
M NaCl solution for interference measurement. The experimental results proved that the flexible arrayed RuO
₂
/0.01 wt% GO chlorine ion sensor has good selectivity. The hysteresis potentials of the flexible arrayed RuO
₂
/0.01 wt% GO chlorine ion sensor were 1.548 mV and 1.138 mV in the NaCl solutions during the cycles of 1 M→ 10
^-1
M→ 1 M→ 10
^-3
M→ 1 M and 1 M→ 10
^-3
M→ 1 M→ 10
^-1
M→ 1 M, respectively. The drift rate of the flexible arrayed RuO
₂
/0.01 wt% GO chlorine ion sensor was 0.186 mV/hr in 10
^-2
M NaCl solution. According the experiment result, the GO was used to modify the RuO
₂
sensing membrane, and the 0.01 wt% GO increased the sensing film conductivity and could reduce the response time, hysteresis effect and drift effect.