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Papp IZ, Szerlauth A, Szűcs T, Bélteky P, Perez JFG, Kónya Z, Kukovecz Á. Fabrication and characterization of a bifunctional zinc oxide/multiwalled carbon nanotube/ poly(3,4-ethylenedioxythiophene): Polystyrene sulfonate composite thin film. THIN SOLID FILMS 2023; 778:139908. [DOI: 10.1016/j.tsf.2023.139908] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/18/2025]
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Petrov VV, Ivanishcheva AP, Volkova MG, Storozhenko VY, Gulyaeva IA, Pankov IV, Volochaev VA, Khubezhov SA, Bayan EM. High Gas Sensitivity to Nitrogen Dioxide of Nanocomposite ZnO-SnO 2 Films Activated by a Surface Electric Field. NANOMATERIALS 2022; 12:nano12122025. [PMID: 35745364 PMCID: PMC9230884 DOI: 10.3390/nano12122025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/12/2022] [Revised: 06/09/2022] [Accepted: 06/10/2022] [Indexed: 12/04/2022]
Abstract
Gas sensors based on the multi-sensor platform MSP 632, with thin nanocomposite films based on tin dioxide with a low content of zinc oxide (0.5–5 mol.%), were synthesized using a solid-phase low-temperature pyrolysis technique. The resulting gas-sensitive ZnO-SnO2 films were comprehensively studied by atomic force microscopy, Kelvin probe force microscopy, X-ray diffraction, scanning electron microscopy, transmission electron microscopy, scanning transmission electron microscopy, energy dispersive X-ray spectrometry, and X-ray photoelectron spectroscopy. The obtained films are up to 200 nm thick and consist of ZnO-SnO2 nanocomposites, with ZnO and SnO2 crystallite sizes of 4–30 nm. Measurements of ZnO-SnO2 films containing 0.5 mol.% ZnO showed the existence of large values of surface potential, up to 1800 mV, leading to the formation of a strong surface electric field with a strength of up to 2 × 107 V/cm. The presence of a strong surface electric field leads to the best gas-sensitive properties: the sensor’s responsivity is between two and nine times higher than that of sensors based on ZnO-SnO2 films of other compositions. A study of characteristics sensitive to NO2 (0.1–50 ppm) showed that gas sensors based on the ZnO-SnO2 film demonstrated a high sensitivity to NO2 with a concentration of 0.1 ppm at an operating temperature of 200 °C.
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Affiliation(s)
- Victor V. Petrov
- Institute of Nanotechnologies, Electronics, and Equipment Engineering, Southern Federal University, 347928 Taganrog, Russia;
- Correspondence: (V.V.P.); (A.P.I.); Tel.: +7-863-437-1624 (V.V.P.)
| | - Alexandra P. Ivanishcheva
- Institute of Nanotechnologies, Electronics, and Equipment Engineering, Southern Federal University, 347928 Taganrog, Russia;
- Correspondence: (V.V.P.); (A.P.I.); Tel.: +7-863-437-1624 (V.V.P.)
| | - Maria G. Volkova
- Department of Chemistry, Southern Federal University, 344090 Rostov-on-Don, Russia; (M.G.V.); (V.Y.S.); (E.M.B.)
| | - Viktoriya Yu. Storozhenko
- Department of Chemistry, Southern Federal University, 344090 Rostov-on-Don, Russia; (M.G.V.); (V.Y.S.); (E.M.B.)
| | - Irina A. Gulyaeva
- Institute of Nanotechnologies, Electronics, and Equipment Engineering, Southern Federal University, 347928 Taganrog, Russia;
| | - Ilya V. Pankov
- Institute of Physical and Organic Chemistry, Southern Federal University, Stachki Av. 194/2, 344090 Rostov-on-Don, Russia; (I.V.P.); (V.A.V.)
| | - Vadim A. Volochaev
- Institute of Physical and Organic Chemistry, Southern Federal University, Stachki Av. 194/2, 344090 Rostov-on-Don, Russia; (I.V.P.); (V.A.V.)
| | - Soslan A. Khubezhov
- Research Laboratory of Functional Nanomaterials Technology, Southern Federal University, Shevchenko St. 2, 344006 Taganrog, Russia;
- Department of Nanophotonics and Metamaterials, ITMO University, 197101 St. Petersburg, Russia
- Department of Physics, North-Ossetian State University, Vatutina Str. 46, 362025 Vladikavkaz, Russia
| | - Ekaterina M. Bayan
- Department of Chemistry, Southern Federal University, 344090 Rostov-on-Don, Russia; (M.G.V.); (V.Y.S.); (E.M.B.)
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Ultrathin Leaf-Shaped CuO Nanosheets Based Sensor Device for Enhanced Hydrogen Sulfide Gas Sensing Application. CHEMOSENSORS 2021. [DOI: 10.3390/chemosensors9080221] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Herein, a simple, economical and low temperature synthesis of leaf-shaped CuO nanosheets is reported. As-synthesized CuO was examined through different techniques including field emission scanning electron microscopy (FESEM), energy dispersive spectroscopy (EDS), transmission electron microscopy (TEM), high-resolution TEM (HRTEM), X-ray diffraction (XRD), fourier transform infrared spectroscopic (FTIR) and Raman spectroscopy to ascertain the purity, crystal phase, morphology, vibrational, optical and diffraction features. FESEM and TEM images revealed a thin leaf-like morphology for CuO nanosheets. An interplanar distance of ~0.25 nm corresponding to the (110) diffraction plane of the monoclinic phase of the CuO was revealed from the HRTEM images XRD analysis indicated a monoclinic tenorite crystalline phase of the synthesized CuO nanosheets. The average crystallite size for leaf-shaped CuO nanosheets was found to be 14.28 nm. Furthermore, a chemo-resistive-type gas sensor based on leaf-shaped CuO nanosheets was fabricated to effectively and selectively detect H2S gas. The fabricated sensor showed maximum gas response at an optimized temperature of 300 °C towards 200 ppm H2S gas. The corresponding response and recovery times were 97 s and 100 s, respectively. The leaf-shaped CuO nanosheets-based gas sensor also exhibited excellent selectivity towards H2S gas as compared to other analyte gases including NH3, CH3OH, CH3CH2OH, CO and H2. Finally, we have proposed a gas sensing mechanism based upon the formation of chemo-resistive CuO nanosheets.
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Ethanol Sensing Properties and First Principles Study of Au Supported on Mesoporous ZnO Derived from Metal Organic Framework ZIF-8. SENSORS 2021; 21:s21134352. [PMID: 34202170 PMCID: PMC8272103 DOI: 10.3390/s21134352] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/14/2021] [Revised: 06/20/2021] [Accepted: 06/23/2021] [Indexed: 11/17/2022]
Abstract
It is of great significance to develop ethanol sensors with high sensitivity and low detection temperature. Hence, we prepared Au-supported material on mesoporous ZnO composites derived from a metal-organic framework ZIF-8 for the detection of ethanol gas. The obtained Au/ZnO materials were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), field emission scanning electron microscopy (SEM), field emission transmission electron microscopy (TEM) and nitrogen adsorption and desorption isotherms. The results showed that the Au/ZnO-1.0 sample maintains a three-dimensional (3D) dodecahedron structure with a larger specific surface area (22.79 m2 g−1) and has more oxygen vacancies. Because of the unique ZIF structure, abundant surface defects and the formation of Au-ZnO Schottky junctions, an Au/ZnO-1.0 sensor has a response factor of 37.74 for 100 ppm ethanol at 250 °C, which is about 6 times that of pure ZnO material. In addition, the Au/ZnO-1.0 sensor has good selectivity for ethanol. According to density functional theory (DFT) calculations, the adsorption energy of Au/ZnO for ethanol (−1.813 eV) is significantly greater than that of pure ZnO (−0.217 eV). Furthermore, the adsorption energy for ethanol is greater than that of other gases.
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