To obtain the optimal sensor responses to enhance the sensitivity, the CNT sensor L/W ratio was tested. Various L/W ratio from 2 to 16 were tested to obtain the Ohmic resistance by scanning a LSV from -1.0 V to 1.0 V. As is shown in Fig. , the increasing L/W ratio due to a narrower channel resulted in a higher resistance. As L/W ratio increases from 2, 4, 8, to 16, the resistances increased from 2.11, 3.22, 9.98, 12.32, to 13.44 kΩ. It is evident that the dimensions of the device can be properly controlled by the mask design associated with the wax pattern design. To obtain a good conductance of the channel, L/W at 4 was chosen as the optimal to offer a low resistance. As we see from