This paper presents a novel ultraviolet (UV) irradiation assisted nanostructured ZnO film for high performance oxygen sensing under a low working temperature. Nanorod ZnO structures with high exposing area are synthesized on a glass substrate with interdigital sensing electrodes via the developed two-stage sol-gel and hydrothermal processes. A UV-LED with an emission wavelength of 370 nm is then used to enhance the sensing performance of the nanostructured ZnO film. The oxygen sensor can work at a temperature of 50 C with the assistance of UV irradiation. The response of the UV-assisted ZnO film is 4.66 times larger than the same film without UV exposure. The method developed in the present study provides a simple yet high performance method for oxygen sensing under low operation temperatures.

This paper develops a high performance extended-gate field-effect-transistor-based pH sensor utilizing industrial-grade touch panel film (TPF) as the sensing material. The TPF is composed of a polyethylene terephthalate substrate coated with an indium tin oxide, a silicon dioxide, and a niobium pentoxide (ITO/SiO 2 /Nb 2 O 5 ) layers. Since industrial roll-to-roll process is used to produce the TPF such that the cost and the quality for the film are very competitive for producing disposable sensors. Results show the developed sensor exhibits high sensitivity of 59.2 mV/pH in the range of pH from 3 to 13 with a good linearity of R 2 = 0.9948. It also shows excellent sensing performance including ultrafast response (∼1 s), good repeatability (variation ∼2%), and stability (variation ∼1%). When interfered with high concentration Na + ions (0.1 M) by adding normal saline water, the response increases slightly and sustain linearity. In addition, the performance of the developed sensor owing to sensing area change is evaluated that presents good linearity and consistent in the sensing areas range 11 2 ∼20 2 mm 2 . Accordingly, the developed TPF-based pH sensor has presented its potentials for rapid and low-cost hydrogen ion detections.Index Terms-EGFET, touch panel film, pH sensor, ITO, hydrogen ion.

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