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Ethanol Sensing Properties and Dominant Sensing Mechanism of NiO-Decorated SnO2 Nanorod Sensors
선건주,이재경,이완인,Ram Prakash Dwivedi,이종무,고태경 대한금속·재료학회 2017 ELECTRONIC MATERIALS LETTERS Vol.13 No.3
NiO-decorated SnO2 nanorods were synthesized by the thermalevaporation of Sn powders followed by the solvothermal deposition ofNiO. A multi-networked p-n heterostructured nanorod sensor wasfabricated by dropping the p-NiO-decorated n-SnO2 nanorods onto theinterdigited electrode pattern and then annealing. The multi-networkedp-n heterostructured nanorod sensor exhibited enhanced response toethanol compared with the pristine SnO2 nanorod and NiO nanoparticlesensors. The former also exhibited a shorter sensing time for ethanol. Both sensors exhibited selectivity for ethanol over other volatile organiccompounds (VOCs) such as HCHO, methanol, benzene and tolueneand the decorated sensor exhibited superior selectivity to the other twosensors. In addition, the dominant sensing mechanism is discussed indetail by comparing the sensing properties and current-voltagecharacteristics of a p-NiO/n-SnO2 heterostructured nanorod sensor withthose of a pristine SnO2 nanorod sensor and a pristine NiO nanoparticlesensor. Of the two competing electronic mechanisms: a potentialbarrier-controlled carrier transport mechanism at a NiO-SnO2 p-njunction and a surface-depletion-controlled carrier transport mechanism,the former has some contribution to the enhanced gas sensingperformance of the p-n heterostructured nanorod sensor, however, itscontribution is not as significant as that of the latter.
Structure and ultrafast ethanol sensing properties of In2O3-capped Zn-doped Fe2O3 nanorods
박성훈,선건주,길혜준,이유리,노경호,이종무 한국물리학회 2015 Current Applied Physics Vol.15 No.11
This paper reports the facile synthesis of In2O3-capped Zn-doped Fe2O3 nanorods along with their ethanol gas sensing properties. A two-stage process involving thermal oxidation of Fe foils and Zn powders in air and the sputter-deposition of In2O3 was used to synthesize these nanostructures. The nanorods synthesized using this method were ~5 mm in length and 50-120 nm in diameter with a shell layer thickness of 10e15 nm. The multiple-networked In2O3-capped Zn-doped Fe2O3 nanorod sensor showed a significantly enhanced and ultrafast response to ethanol gas. The enhanced sensing performance was explained by modulation of the potential barrier height and the strong catalytic activity of In2O3 for ethanol oxidation.
Sensing Properties of Networked Catalyst-metal-codoped Te2O5 Nanowire Sensors
박성훈,선건주,길혜준,이종무,김경국 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.67 No.4
Pt and Ag-codoped Te2O5 nanowires were synthesized by using a two-step process: thermal oxidation of Te powders followed by sputter-deposition of Ag. Multiple-networked sensors were fabricated by using four different types of nanowires: Pt and Ag-codoped Te2O5 nanowires, Ptdoped Te2O5 nanowires, Ag-doped Te2O5 nanowires and pristine Te2O5 nanowires; their acetone gas sensing properties were examined. The Pt and Ag-codoped Te2O5 nanowire sensor exhibited stronger response to acetone gas than the monometal-doped counterparts, as well as the undoped Te2O5 nanowire sensor. The codoped Te2O5 nanowire sensor also showed faster response to acetone gas than the latter. All four sensors showed an optimal operating temperature of 150 C for acetone gas sensing and selectivity for acetone gas over CO, toluene, benzene and LPG gases. The underlying mechanism of the enhanced sensing performance of the Pt and Ag-codoped Te2O5 nanowire sensor is discussed.
UV-assisted room temperature-gas sensing of Ga2O3-core/ZnO-shell nanowires
박성훈,선건주,이종무 한양대학교 세라믹연구소 2015 Journal of Ceramic Processing Research Vol.16 No.4
Ga2O3-based gas sensors show very poor performance at room temperature despite being able to detect a range of gases efficiently at high temperatures of 600-1,000 ℃, which limits their practical use. Ga2O3-core/ZnO-shell nanowires were synthesized by the thermal evaporation of GaN powders followed by the atomic layer deposition of ZnO and then multiple networked Ga2O3-core/ZnO-shell nanowire gas sensors were fabricated. The morphology, crystal structure, and sensing properties of pristine Ga2O3 nanowires and Ga2O3-core/ZnO-shell nanowires to NO2 gas at room temperature under ultraviolet (UV) illumination were examined. Pristine Ga2O3 nanowires and Ga2O3-core/ZnO-shell nanowires showed responses ranging from ~ 249 to ~ 703% and from ~ 557 to ~ 2,110%, respectively, to 1-5 ppm NO2 under UV (365 nm, 1.2 mW/cm2 ) illumination, corresponding to 2.2-3.0 fold increases, by encapsulation of ZnO nanowires with ZnO. On the other hand, the responses of both types of nanowires were almost 0 at room temperature in the NO2 concentration range of 1-5 ppm. The underlying mechanism for the enhanced gas sensing properties of Ga2O3-core/ZnO-shell nanowires toward NO2 gas under UV illumination is discussed in detail.
Hydrogen Gas Detection of Nb2O5 Nanoparticle-Decorated CuO Nanorod Sensors
길혜준,선건주,이재경,Ali Mirzaei,최승복,이종무 대한금속·재료학회 2017 METALS AND MATERIALS International Vol.23 No.1
Pristine and Nb2O5 nanoparticles-decorated CuO nanorods were prepared successfully by a two step process: the thermal evaporation of a Cu foil and the spin coating of NbCl5 solution on CuO nanorods followed by thermal annealing. X-ray diffraction was performed to examine the structure and purity of the synthesized nanoatuctures. Scanning electron microscopy was used to examine the morphology and shape of the nanostuctures. The Nb2O5 nanoparticles-decorated CuO nanorod sensor showed responses of ~217.05-862.54%, response times of ~161-199 s and recovery times of ~163-171 s toward H2 gas with concentrations in a range of 0.5 - 5% at the optimal working temperature of 300 °C. The Nb2O5 nanoparticle-decorated CuO nanorod sensor showed superior sensing performance to the pristine CuO nanorod sensor for the same H2 concentration range. The underlying mechanism for the enhanced hydrogen sensing performance of the CuO nanorods decorated with Nb2O5 nanoparticles is discussed.
김수현,박성훈,선건주,현승균,김경국,이종무 한국물리학회 2015 Current Applied Physics Vol.15 No.8
In2O3 nanowires functionalized with Fe2O3 nanoparticles were synthesized by the thermal evaporation of In2S3 powders in an oxidizing atmosphere followed by the solvothermal deposition of Fe2O3 and their acetone gas sensing properties were examined. The pristine and Fe2O3-functionalized In2O3 nanowires exhibited responses of 141e390% and 298e960%, respectively, to 10e500 ppm acetone at 200 ℃. The Fe2O3-functionalized In2O3 nanowire sensor showed stronger electrical response to acetone gas at 200 ℃ than the pristine In2O3 nanowire counterpart. The former showed more rapid response but slower recovery than the latter. Both the pristine and Fe2O3-functionalized In2O3 nanowire sensors showed the strongest response to acetone gas at 200 ℃. The underlying mechanism for the enhanced sensing performance of the Fe2O3-functionalized In2O3 nanowire sensor towards acetone gas is discussed.