This work reports the copper oxide (CuO) single nanowire (SNW) based devices for the detection of volatile organic compounds (VOCs). Fabrication involves the synthesis of CuO nanowires by thermal oxidation of copper. The SNW back-to-back Schottky diode electrodes are fabricated by microcantilever contact print ( \mu CCP) of silver nanoparticles (AgNP) on Si-SiO _{2} substrate. Devices with channel lengths 10, 20, and 30 \mu m are employed to detect VOCs such as ethanol, acetone, and 2-propanol, etc., with concentrations ranging from... Continue reading…

Zn 2 TiO 4 thin film is formed on Si/SiO 2 substrate by a spin coating process and Al is used as electrodes. This device has excellent hydrogen (H 2 ) gas sensing properties. The phase and crystal structure of the thin film was studied using X-ray diffraction. The sensor responds linearly at room temperature to H 2 gas concentrations ranging from 50 to 250 ppm and shows a good sensitivity toward low ppm of H 2 . The response time of the sensor is about 76 s at 250-ppm H 2 . We could fit the sensor response to the... Continue reading…

The fabrication of a sub-10 μm Se-Fe 2 O 3 channel Schottky diode built using cantilever-based Ag-contact printing technology is discussed in this work. There are two phases to the fabrication process. In the first phase, the Ag electrodes are produced using a state-of-the-art micro-girder (μG) cantilever-based in-house printing system. The second phase involves dropcasting the dispersion of leaf-structured Se-Fe 2 O 3 in deionized (DI) water between the printed electrodes. The printed device's electrical response is observed to be similar to that of a Schottky diode. An analytical model based on the thermionic emission theory was used to verify these features with the acquired experimental results. The ideality factor of the device is extracted as 3.44. At room temperature, the device... Continue reading…

This work describes the fabrication of a Carbon monoxide (CO) sensor based on a Zinc oxide (ZnO) Schottky diode that can detect CO at low concentrations as low as one part per million (ppm) at room temperature. Different additive microfabrication techniques are used to fabricate the devices. A precisely controlled fabrication is enabled by employing a microcantilever ( μC ) printing system. The fully printed sensor has a high sensitivity of 23.7% towards CO at room temperature. The height of the Schottky barrier significantly influences the response of the device. Furthermore, all sensors specificity was analyzed for some of the gases, and volatile organic compounds (VOCs) found in breath. The fully printed device... Continue reading…

This article describes the fabrication of Zinc Ferrite-Zinc oxide (ZFO-ZnO) heterostructure devices and the various sensing schemes that can be exploited using the same. A solvothermal approach has been used for the synthesis of ZFO-ZnO heterostructures having different compositions. The investigation of magnetic and electric properties is performed by varying the ratio of Zn 2+ and Fe 3+ ions. These heterostructures show enhanced magnetization with (i) an increase in the concentration of Fe 3+ ions and (ii) exposure to hydrogen (H 2 ) gas. These fine molar ratio adjustments in magnetism are engineered to obtain desirable sensing properties. We fabricated several two-terminal devices Continue reading…