Evaluation of Indium Tin Oxide for Gas Sensing Applications: Adsorption/Desorption and Electrical Conductivity Studies on Powders and Thick Films

By combining results of adsorption/desorption measurements on powders and electrical conductivity studies on thick and thin films, the interaction of indium tin oxide with various ambient gas species and carbon monoxide as potential target gas was studied between room temperature and 700 °C. The results show that the indium tin oxide surfaces exhibit a significant coverage of water-related and carbonaceous adsorbates even at temperatures as high as 600 °C. Specifically carbonaceous species, which are also produced under carbon monoxide exposure, show a detrimental effect on oxygen adsorption and may impair the film’s sensitivity to a variety of target gases if the material is used in gas sensing applications. Consequently, the operating temperature of an ITO based chemoresistive carbon monoxide sensor should be selected within a range where the decomposition and desorption of these species proceeds rapidly, while the surface oxygen coverage is still high enough to provide ample species for target gas interaction.

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Recent Advances in ZnO-Based Carbon Monoxide Sensors: Role of Doping

Sensors ◽

10.3390/s21134425 ◽

2021 ◽

Vol 21 (13) ◽

pp. 4425

Author(s):

Ana María Pineda-Reyes ◽

María R. Herrera-Rivera ◽

Hugo Rojas-Chávez ◽

Heriberto Cruz-Martínez ◽

Dora I. Medina

Keyword(s):

Carbon Monoxide ◽

High Performance ◽

Gas Sensing ◽

Experimental Studies ◽

Electrical Performance ◽

Long Term Stability ◽

Sensing Applications ◽

Recent Advances ◽

Sensitivity And Selectivity ◽

Doped Zno

Monitoring and detecting carbon monoxide (CO) are critical because this gas is toxic and harmful to the ecosystem. In this respect, designing high-performance gas sensors for CO detection is necessary. Zinc oxide-based materials are promising for use as CO sensors, owing to their good sensing response, electrical performance, cost-effectiveness, long-term stability, low power consumption, ease of manufacturing, chemical stability, and non-toxicity. Nevertheless, further progress in gas sensing requires improving the selectivity and sensitivity, and lowering the operating temperature. Recently, different strategies have been implemented to improve the sensitivity and selectivity of ZnO to CO, highlighting the doping of ZnO. Many studies concluded that doped ZnO demonstrates better sensing properties than those of undoped ZnO in detecting CO. Therefore, in this review, we analyze and discuss, in detail, the recent advances in doped ZnO for CO sensing applications. First, experimental studies on ZnO doped with transition metals, boron group elements, and alkaline earth metals as CO sensors are comprehensively reviewed. We then focused on analyzing theoretical and combined experimental–theoretical studies. Finally, we present the conclusions and some perspectives for future investigations in the context of advancements in CO sensing using doped ZnO, which include room-temperature gas sensing.

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HCl gas adsorption/desorption properties of poly(N-isopropylacrylamide) brushes grafted onto quartz resonator for gas-sensing applications

Sensors and Actuators B Chemical ◽

10.1016/j.snb.2014.10.137 ◽

2015 ◽

Vol 208 ◽

pp. 106-111 ◽

Cited By ~ 14

Author(s):

Masanobu Matsuguchi ◽

Kenta Takaoka ◽

Haruka Kai

Keyword(s):

Gas Adsorption ◽

Gas Sensing ◽

Quartz Resonator ◽

Sensing Applications ◽

Hcl Gas ◽

Adsorption Desorption

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Near-IR transparent conductive amorphous tungsten oxide thin layers by non-reactive radio-frequency magnetron sputtering

EPJ Web of Conferences ◽

10.1051/epjconf/202125505003 ◽

2021 ◽

Vol 255 ◽

pp. 05003

Author(s):

Hao Chen ◽

Alessandro Chiasera ◽

Cristina Armellini ◽

Giorgio Speranza ◽

Stefano Varas ◽

...

Keyword(s):

Electrical Conductivity ◽

Tin Oxide ◽

Indium Tin Oxide ◽

Figure Of Merit ◽

Rf Sputtering ◽

Thin Layers ◽

Radio Frequency Magnetron Sputtering ◽

Amorphous Thin Films ◽

Near Ir ◽

Electric Contacts

Key assets for transparent electric contacts in optoelectronic applications are high conductivity and large transparency over extended spectral range. Indium-Tin-Oxide and Aluminium-doped-Zinc-oxide are commercial examples, with their electrical conductivity resembling those of metals, despite, their transparency being limited up to 1.5µm. This work introduces smooth and compact amorphous thin films of n-type semiconducting WO3-x prepared by RF-sputtering followed by annealing in dry air, as optical layers of tailorable dielectric properties. We evaluate Figure of Merit, combining electrical conductivity and optical transparency, and rate the performances as a transparent conductive layer.

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Numerical analysis of an infrared gas sensor utilizing an indium-tin-oxide-based plasmonic slot waveguide

Journal of Sensors and Sensor Systems ◽

10.5194/jsss-11-15-2022 ◽

2022 ◽

Vol 11 (1) ◽

pp. 15-20

Author(s):

Parviz Saeidi ◽

Bernhard Jakoby ◽

Gerald Pühringer ◽

Andreas Tortschanoff ◽

Gerald Stocker ◽

...

Keyword(s):

Tin Oxide ◽

Indium Tin Oxide ◽

Noble Metals ◽

Microelectromechanical Systems ◽

Propagation Loss ◽

Slot Waveguide ◽

Plasmonic Waveguides ◽

Propagation Length ◽

Plasmonic Material ◽

Sensing Applications

Abstract. Plasmonic waveguides have attracted much attention owing to the associated high field intensity at the metal–dielectric interface and their ability to confine the modes at the nanometer scale. At the same time, they suffer from relatively high propagation loss, which is due to the presence of metal. Several alternative materials have been introduced to replace noble metals, such as transparent conductive oxides (TCOs). A particularly popular TCO is indium tin oxide (ITO), which is compatible with standard microelectromechanical systems (MEMS) technology. In this work, the feasibility of ITO as an alternative plasmonic material is investigated for infrared absorption sensing applications: we numerically design and optimize an ITO-based plasmonic slot waveguide for a wavelength of 4.26 µm, which is the absorption line of CO2. Our optimization is based on a figure of merit (FOM), which is defined as the confinement factor divided by the imaginary part of the effective mode index (i.e., the intrinsic damping of the mode). The obtained optimal FOM is 3.2, which corresponds to 9 µm and 49 % for the propagation length (characterizing the intrinsic damping) and the confinement factor, respectively.

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Growth of Epitaxial Orthorhombic Tin Oxide Films on Various YSZ Substrates for Gas Sensing Applications

ECS Meeting Abstracts ◽

10.1149/ma2012-01/44/1601 ◽

2012 ◽

Keyword(s):

Tin Oxide ◽

Gas Sensing ◽

Oxide Films ◽

Sensing Applications ◽

Tin Oxide Films

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Gas Sensing Properties of NiSb2O6 Micro- and Nanoparticles in Propane and Carbon Monoxide Atmospheres

Journal of Nanomaterials ◽

10.1155/2017/8792567 ◽

2017 ◽

Vol 2017 ◽

pp. 1-9 ◽

Cited By ~ 8

Author(s):

Verónica-M. Rodríguez-Betancourtt ◽

Héctor Guillén Bonilla ◽

Martín Flores Martínez ◽

Alex Guillén Bonilla ◽

J. P. Moran Lazaro ◽

...

Keyword(s):

Electron Microscopy ◽

Carbon Monoxide ◽

Gas Sensing ◽

Average Diameter ◽

Cell Parameters ◽

Sensing Applications ◽

Transmission Electron ◽

Colloidal Method ◽

Antimony Chloride ◽

20 Nm

Micro- and nanoparticles of NiSb2O6 were synthesized by the microwave-assisted colloidal method. Nickel nitrate, antimony chloride, ethylenediamine, and ethyl alcohol were used. The oxide was obtained at 600°C and was analyzed by X-ray diffraction (XRD) and Raman spectroscopy, showing a trirutile-type structure with cell parameters a = 4.641 Å, c = 9.223 Å, and a space group P42/mnm (136). Average crystal size was estimated at ~31.19 nm, according to the XRD-peaks. The microstructure was scrutinized by scanning electron microscopy (SEM), observing microrods measuring ~3.32 μm long and ~2.71 μm wide, and microspheres with an average diameter of ~8 μm; the size of the particles shaping the microspheres was measured in the range of ~0.22 to 1.8 μm. Transmission electron microscopy (TEM) revealed that nanoparticles were obtained with sizes in the range of 2 to 20 nm (~10.7 nm on average). Pellets made of oxide’s powders were tested in propane (C3H8) and carbon monoxide (CO) atmospheres at different concentrations and temperatures. The response of the material increased significantly as the temperature and the concentration of the test gases rose. These results show that NiSb2O6 may be a good candidate for gas sensing applications.

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