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Wu Z, Chen Z, Deng Z, Dai N, Sun Y, Ge M. A high-performance room-temperature NH 3 gas sensor based on WO 3/TiO 2 nanocrystals decorated with Pt NPs. RSC Adv 2024; 14:12225-12234. [PMID: 38628481 PMCID: PMC11019483 DOI: 10.1039/d4ra00881b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2024] [Accepted: 04/01/2024] [Indexed: 04/19/2024] Open
Abstract
In this work, a high-performance room-temperature ammonia (NH3) gas sensor based on Pt-modified WO3-TiO2 nanocrystals was synthesized via a two-step hydrothermal method. The structural properties were characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. The 10 at% Pt@WO3-TiO2 nanocrystals present the highest NH3 sensing performance at room temperature. Compared with the nanocrystals without Pt modification, the sensitivity of the Pt@WO3-TiO2 sensor is tenfold higher, with the lowest concentration threshold reaching the 75 ppb level. The response is approximately 92.28 to 50 ppm, and response and recovery times are 23 s and 8 s, respectively. The improved sensing was attributed to a synergetic mechanism involving the space charge layer effect and Pt metal sensitization, enhancing the electron transfer efficiency, oxygen vacancy and specific surface area. This study is expected to guide the development of high-performance room-temperature ammonia sensors for clinical breath testing.
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Affiliation(s)
- Zhixuan Wu
- School of Physical Science and Technology, ShanghaiTech University Shanghai 201210 China
- State Key Laboratory of Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences Shanghai 200083 China
| | - Zhengai Chen
- State Key Laboratory of Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences Shanghai 200083 China
| | - Zhixiang Deng
- State Key Laboratory of Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences Shanghai 200083 China
| | - Ning Dai
- State Key Laboratory of Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences Shanghai 200083 China
| | - Yan Sun
- State Key Laboratory of Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences Shanghai 200083 China
| | - Meiying Ge
- National Engineering Research Center for Nanotechnology Shanghai 200241 PR China
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Kanan S, Obeideen K, Moyet M, Abed H, Khan D, Shabnam A, El-Sayed Y, Arooj M, Mohamed AA. Recent Advances on Metal Oxide Based Sensors for Environmental Gas Pollutants Detection. Crit Rev Anal Chem 2024:1-34. [PMID: 38506453 DOI: 10.1080/10408347.2024.2325129] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/21/2024]
Abstract
Optimizing materials and associated structures for detecting various environmental gas pollutant concentrations has been a major challenge in environmental sensing technology. Semiconducting metal oxides (SMOs) fabricated at the nanoscale are a class of sensor technology in which metallic species are functionalized with various dopants to modify their chemiresistivity and crystalline scaffolding properties. Studies focused on recent advances of gas sensors utilizing metal oxide nanostructures with a special emphasis on the structure-surface property relationships of some typical n-type and p-type SMOs for efficient gas detection are presented. Strategies to enhance the gas sensor performances are also discussed. These oxide material sensors have several advantages such as ease of handling, portability, and doped-based SMO sensing detection ability of environmental gas pollutants at low temperatures. SMO sensors have displayed excellent sensitivity, selectivity, and robustness. In addition, the hybrid SMO sensors showed exceptional selectivity to some CWAs when irradiated with visible light while also displaying high reversibility and humidity independence. Results showed that TiO2 surfaces can sense 50 ppm SO2 in the presence of UV light and under operating temperatures of 298-473 K. Hybrid SMO displayed excellent gas sensing response. For example, a CuO-ZnO nanoparticle network of a 4:1 vol.% CuO/ZnO ratio exhibited responses three times greater than pure CuO sensors and six times greater than pure ZnO sensors toward H2S. This review provides a critical discussion of modified gas pollutant sensing capabilities of metal oxide nanoparticles under ambient conditions, focusing on reported results during the past two decades on gas pollutants sensing.
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Affiliation(s)
- Sofian Kanan
- Department of Biology, Chemistry and Environmental Sciences, American University of Sharjah, Sharjah, UAE
| | - Khaled Obeideen
- Sustainable Energy and Power Systems Research Center, RISE, University of Sharjah, Sharjah, UAE
| | - Matthew Moyet
- School of Biology and Ecology, University of Maine, Orono, Maine, USA
| | - Heba Abed
- Department of Biology, Chemistry and Environmental Sciences, American University of Sharjah, Sharjah, UAE
| | - Danyah Khan
- Department of Biology, Chemistry and Environmental Sciences, American University of Sharjah, Sharjah, UAE
| | - Aysha Shabnam
- Department of Biology, Chemistry and Environmental Sciences, American University of Sharjah, Sharjah, UAE
| | | | - Mahreen Arooj
- Department of Chemistry, University of Sharjah, Sharjah, UAE
| | - Ahmed A Mohamed
- Department of Chemistry, University of Sharjah, Sharjah, UAE
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Raes A, Ninakanti R, Van den Bergh L, Borah R, Van Doorslaer S, Verbruggen SW. Black titania by sonochemistry: A critical evaluation of existing methods. ULTRASONICS SONOCHEMISTRY 2023; 100:106601. [PMID: 37722246 PMCID: PMC10518725 DOI: 10.1016/j.ultsonch.2023.106601] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/21/2023] [Revised: 08/31/2023] [Accepted: 09/13/2023] [Indexed: 09/20/2023]
Abstract
In the field of photocatalysis, the fabrication of black titania is a booming topic, as it offers a system with improved solar light harvesting properties and increased overall efficiency. The darkening of white TiO2 powders can be ascribed to surface hydroxylation, oxygen vacancies, Ti3+ centres, or a combination thereof. A handful of studies suggests these defects can be conveniently introduced by acoustic cavitation, generated during sonochemical treatment of pristine TiO2 powders. In reproducing these studies, P25 TiO2 samples were ultrasonicated for various hours with a power density of 8000 W/L, resulting in powders that indeed became gradually darker with increasing sonication time. However, HAADF-STEM revealed that extensive erosion of the sonotrode tip took place and contaminated the samples, which appeared to be the primary reason for the observed colour change. This was confirmed by UV-Vis DRS and DRIFTS, that showed no significant alteration of the catalyst surface after sonication. EPR measurements showed that only an insignificant fraction of Ti3+ centres were produced, far less than in a TiO2 sample that was chemically reduced with NaBH4. No evidence of the presence oxygen vacancies could be found. The enhanced photocatalytic activities of ultrasonicated materials reported in literature can therefore not be ascribed to the synthesis of actual black (defected) TiO2, but rather to specific changes in morphology as a result of acoustic cavitation. Also, this study underlines the importance of considering probe erosion in sonochemical catalyst synthesis, which is an unavoidable side effect that can have an important impact on the catalyst appearance, properties and performance.
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Affiliation(s)
- Arno Raes
- Sustainable Energy, Air & Water Technology (DuEL), University of Antwerp, Groenenborgerlaan 171, 2020 Antwerp, Belgium; NANOlab Center of Excellence, University of Antwerp, Groenenborgerlaan 171, 2020 Antwerp, Belgium
| | - Rajeshreddy Ninakanti
- Sustainable Energy, Air & Water Technology (DuEL), University of Antwerp, Groenenborgerlaan 171, 2020 Antwerp, Belgium; NANOlab Center of Excellence, University of Antwerp, Groenenborgerlaan 171, 2020 Antwerp, Belgium
| | - Lore Van den Bergh
- Laboratory of Physics and BioMedical Physics (BIMEF), University of Antwerp, B-2610 Wilrijk, Belgium; Laboratory of Adsorption and Catalysis (LADCA), University of Antwerp, B-2610 Wilrijk, Belgium
| | - Rituraj Borah
- Sustainable Energy, Air & Water Technology (DuEL), University of Antwerp, Groenenborgerlaan 171, 2020 Antwerp, Belgium; NANOlab Center of Excellence, University of Antwerp, Groenenborgerlaan 171, 2020 Antwerp, Belgium
| | - Sabine Van Doorslaer
- Laboratory of Physics and BioMedical Physics (BIMEF), University of Antwerp, B-2610 Wilrijk, Belgium
| | - Sammy W Verbruggen
- Sustainable Energy, Air & Water Technology (DuEL), University of Antwerp, Groenenborgerlaan 171, 2020 Antwerp, Belgium; NANOlab Center of Excellence, University of Antwerp, Groenenborgerlaan 171, 2020 Antwerp, Belgium.
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4
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Zhu X, Li Y, Cao P, Li P, Xing X, Yu Y, Guo R, Yang H. Recent Advances of Graphene Quantum Dots in Chemiresistive Gas Sensors. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:2880. [PMID: 37947725 PMCID: PMC10647816 DOI: 10.3390/nano13212880] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/12/2023] [Revised: 10/20/2023] [Accepted: 10/28/2023] [Indexed: 11/12/2023]
Abstract
Graphene quantum dots (GQDs), as 0D graphene nanomaterials, have aroused increasing interest in chemiresistive gas sensors owing to their remarkable physicochemical properties and tunable electronic structures. Research on GQDs has been booming over the past decades, and a number of excellent review articles have been provided on various other sensing principles of GQDs, such as fluorescence-based ion-sensing, bio-sensing, bio-imaging, and electrochemical, photoelectrochemical, and electrochemiluminescence sensing, and therapeutic, energy and catalysis applications. However, so far, there is no single review article on the application of GQDs in the field of chemiresistive gas sensing. This is our primary inspiration for writing this review, with a focus on the chemiresistive gas sensors reported using GQD-based composites. In this review, the various synthesized strategies of GQDs and its composites, gas sensing enhancement mechanisms, and the resulting sensing characteristics are presented. Finally, the current challenges and future prospects of GQDs in the abovementioned application filed have been discussed for the more rational design of advanced GQDs-based gas-sensing materials and innovative gas sensors with novel functionalities.
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Affiliation(s)
- Xiaofeng Zhu
- School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China;
- Institute for Smart Ageing, Beijing Academy of Science and Technology, Beijing 100089, China; (Y.L.); (P.C.); (P.L.); (X.X.); (Y.Y.)
| | - Yongzhen Li
- Institute for Smart Ageing, Beijing Academy of Science and Technology, Beijing 100089, China; (Y.L.); (P.C.); (P.L.); (X.X.); (Y.Y.)
| | - Pei Cao
- Institute for Smart Ageing, Beijing Academy of Science and Technology, Beijing 100089, China; (Y.L.); (P.C.); (P.L.); (X.X.); (Y.Y.)
| | - Peng Li
- Institute for Smart Ageing, Beijing Academy of Science and Technology, Beijing 100089, China; (Y.L.); (P.C.); (P.L.); (X.X.); (Y.Y.)
| | - Xinzhu Xing
- Institute for Smart Ageing, Beijing Academy of Science and Technology, Beijing 100089, China; (Y.L.); (P.C.); (P.L.); (X.X.); (Y.Y.)
| | - Yue Yu
- Institute for Smart Ageing, Beijing Academy of Science and Technology, Beijing 100089, China; (Y.L.); (P.C.); (P.L.); (X.X.); (Y.Y.)
| | - Ruihua Guo
- Institute for Smart Ageing, Beijing Academy of Science and Technology, Beijing 100089, China; (Y.L.); (P.C.); (P.L.); (X.X.); (Y.Y.)
| | - Hui Yang
- School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China;
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Kumarage GWC, Panamaldeniya SA, Maddumage DC, Moumen A, Maraloiu VA, Mihalcea CG, Negrea RF, Dassanayake BS, Gunawardhana N, Zappa D, Galstyan V, Comini E. Synthesis of TiO 2-(B) Nanobelts for Acetone Sensing. SENSORS (BASEL, SWITZERLAND) 2023; 23:8322. [PMID: 37837151 PMCID: PMC10575087 DOI: 10.3390/s23198322] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/01/2023] [Revised: 10/04/2023] [Accepted: 10/04/2023] [Indexed: 10/15/2023]
Abstract
Titanium dioxide nanobelts were prepared via the alkali-hydrothermal method for application in chemical gas sensing. The formation process of TiO2-(B) nanobelts and their sensing properties were investigated in detail. FE-SEM was used to study the surface of the obtained structures. The TEM and XRD analyses show that the prepared TiO2 nanobelts are in the monoclinic phase. Furthermore, TEM shows the formation of porous-like morphology due to crystal defects in the TiO2-(B) nanobelts. The gas-sensing performance of the structure toward various concentrations of hydrogen, ethanol, acetone, nitrogen dioxide, and methane gases was studied at a temperature range between 100 and 500 °C. The fabricated sensor shows a high response toward acetone at a relatively low working temperature (150 °C), which is important for the development of low-power-consumption functional devices. Moreover, the obtained results indicate that monoclinic TiO2-B is a promising material for applications in chemo-resistive gas detectors.
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Affiliation(s)
- Gayan W. C. Kumarage
- SENSOR Lab, Department of Information Engineering, University of Brescia, 25133 Brescia, Italy or (G.W.C.K.)
- Department of Physics and Electronics, Faculty of Science, University of Kelaniya, Kelaniya 11600, Sri Lanka
| | - Shasika A. Panamaldeniya
- Postgraduate Institute of Science, University of Peradeniya, Peradeniya 20400, Sri Lanka
- Department of Physics, Faculty of Science, University of Peradeniya, Peradeniya 20400, Sri Lanka
| | - Dileepa C. Maddumage
- Postgraduate Institute of Science, University of Peradeniya, Peradeniya 20400, Sri Lanka
- Department of Physics, Faculty of Science, University of Peradeniya, Peradeniya 20400, Sri Lanka
| | - Abderrahim Moumen
- SENSOR Lab, Department of Information Engineering, University of Brescia, 25133 Brescia, Italy or (G.W.C.K.)
| | - Valentin A. Maraloiu
- Laboratory of Atomic Structures and Defects in Advanced Materials, National Institute of Materials Physics, Atomistilor str. 405 A, 077125 Magurele, Romania; (V.A.M.)
| | - Catalina G. Mihalcea
- Laboratory of Atomic Structures and Defects in Advanced Materials, National Institute of Materials Physics, Atomistilor str. 405 A, 077125 Magurele, Romania; (V.A.M.)
| | - Raluca F. Negrea
- Laboratory of Atomic Structures and Defects in Advanced Materials, National Institute of Materials Physics, Atomistilor str. 405 A, 077125 Magurele, Romania; (V.A.M.)
| | - Buddhika S. Dassanayake
- Department of Physics, Faculty of Science, University of Peradeniya, Peradeniya 20400, Sri Lanka
| | - Nanda Gunawardhana
- Research and International Affairs, Sri Lanka Technological Campus, Padukka 10500, Sri Lanka
| | - Dario Zappa
- SENSOR Lab, Department of Information Engineering, University of Brescia, 25133 Brescia, Italy or (G.W.C.K.)
| | - Vardan Galstyan
- SENSOR Lab, Department of Information Engineering, University of Brescia, 25133 Brescia, Italy or (G.W.C.K.)
| | - Elisabetta Comini
- SENSOR Lab, Department of Information Engineering, University of Brescia, 25133 Brescia, Italy or (G.W.C.K.)
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Paul D, Aamir L, Aslam A, Rathore D. p-/n-Type Switching in the Ag/BTO/TiO 2 Nanocomposite as a Gas Sensor toward Ethanol, Liquefied Petroleum Gas, and Ammonia. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:11879-11887. [PMID: 37562969 DOI: 10.1021/acs.langmuir.3c01687] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/12/2023]
Abstract
A novel Ag/BTO/TiO2 nanocomposite was prepared using chemical reduction and sol-gel techniques followed by sintering at ∼950 °C to grow rutile TiO2 and remove organic materials and hydroxyl groups. The structural, optical, morphological, dielectric, and gas-sensing properties were investigated using X-ray diffraction, Fourier transform infrared spectroscopy, ultraviolet-visible spectroscopy, scanning electron microscopy, energy dispersive X-ray spectroscopy, and inductance, capacitance, and resistance meter, respectively. The surface plasmon resonance peak of Ag was observed at 428 nm, and the absorption edge of the Ag/BTO/TiO2 nanocomposite was observed at 235 nm, with an energy bandgap of 5.42 eV. The dielectric constant is lower at 25 °C and becomes highest at 350 °C and low frequency. The percentage response is better toward ammonia than ethanol and liquefied petroleum gas (LPG) at 25 °C, while it is greater, ∼87%, for LPG at a higher temperature. The p-/n-type switching and vice versa were recorded in the whole gas-sensing measurement. During response-recovery time, the device performed as n type for ethanol and ammonia and p type for LPG, with a very fast response time of ∼4 s for all gases. The recovery time for ethanol was achieved at 20-25 s, while for LPG and ammonia, it was ∼60 s. Moreover, the negative and positive activation energies also confirm the switching behavior in the novel Ag/BTO/TiO2 nanocomposite.
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Affiliation(s)
- Dipanjan Paul
- Amity School of Applied Sciences, Amity University Rajasthan, Jaipur, Rajasthan 303002, India
| | - Lubna Aamir
- Department of Physics, College of Science for Girls, Aja Campus, University of Ha'il, Post Office Box 2440, Ha'il 8145, Saudi Arabia
| | - Afia Aslam
- Department of Physics, College of Science for Girls, Aja Campus, University of Ha'il, Post Office Box 2440, Ha'il 8145, Saudi Arabia
| | - Deepshikha Rathore
- Amity School of Applied Sciences, Amity University Rajasthan, Jaipur, Rajasthan 303002, India
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Yan Z, Zhang Y, Kang W, Deng N, Pan Y, Sun W, Ni J, Kang X. TiO 2 Gas Sensors Combining Experimental and DFT Calculations: A Review. NANOMATERIALS (BASEL, SWITZERLAND) 2022; 12:3611. [PMID: 36296801 PMCID: PMC9607066 DOI: 10.3390/nano12203611] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/19/2022] [Revised: 10/09/2022] [Accepted: 10/11/2022] [Indexed: 06/16/2023]
Abstract
Gas sensors play an irreplaceable role in industry and life. Different types of gas sensors, including metal-oxide sensors, are developed for different scenarios. Titanium dioxide is widely used in dyes, photocatalysis, and other fields by virtue of its nontoxic and nonhazardous properties, and excellent performance. Additionally, researchers are continuously exploring applications in other fields, such as gas sensors and batteries. The preparation methods include deposition, magnetron sputtering, and electrostatic spinning. As researchers continue to study sensors with the help of modern computers, microcosm simulations have been implemented, opening up new possibilities for research. The combination of simulation and calculation will help us to better grasp the reaction mechanisms, improve the design of gas sensor materials, and better respond to different gas environments. In this paper, the experimental and computational aspects of TiO2 are reviewed, and the future research directions are described.
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Affiliation(s)
- Zirui Yan
- State Key Laboratory of Separation Membranes and Membrane Processes, Tiangong University, Tianjin 300387, China
- School of Physical Science and Technology, Tiangong University, Tianjin 300387, China
| | - Yaofang Zhang
- State Key Laboratory of Separation Membranes and Membrane Processes, Tiangong University, Tianjin 300387, China
- School of Physical Science and Technology, Tiangong University, Tianjin 300387, China
| | - Weimin Kang
- State Key Laboratory of Separation Membranes and Membrane Processes, Tiangong University, Tianjin 300387, China
- School of Textile Science and Engineering, Tiangong University, Tianjin 300387, China
| | - Nanping Deng
- State Key Laboratory of Separation Membranes and Membrane Processes, Tiangong University, Tianjin 300387, China
- School of Textile Science and Engineering, Tiangong University, Tianjin 300387, China
| | - Yingwen Pan
- State Key Laboratory of Separation Membranes and Membrane Processes, Tiangong University, Tianjin 300387, China
- School of Physical Science and Technology, Tiangong University, Tianjin 300387, China
| | - Wei Sun
- State Key Laboratory of Separation Membranes and Membrane Processes, Tiangong University, Tianjin 300387, China
- School of Physical Science and Technology, Tiangong University, Tianjin 300387, China
| | - Jian Ni
- Department of Electronic Science and Technology, College of Electronic Information and Optical Engineering, Nankai University, Tianjin 300350, China
| | - Xiaoying Kang
- State Key Laboratory of Separation Membranes and Membrane Processes, Tiangong University, Tianjin 300387, China
- School of Physical Science and Technology, Tiangong University, Tianjin 300387, China
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Gabriunaite I, Valiuniene A, Ramanavicius S, Ramanavicius A. Biosensors Based on Bio-Functionalized Semiconducting Metal Oxides. Crit Rev Anal Chem 2022; 54:549-564. [PMID: 35714203 DOI: 10.1080/10408347.2022.2088226] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Immobilization of biomaterials is a very important task in the development of biofuel cells and biosensors. Some semiconducting metal-oxide-based supporting materials can be used in these bioelectronics-based devices. In this article, we are reviewing some functionalization methods that are applied for the immobilization of biomaterials. The most significant attention is paid to the immobilization of biomolecules on the surface of semiconducting metal oxides. The improvement of biomaterials immobilization on metal oxides and analytical performance of biosensors by coatings based on conducting polymers, self-assembled monolayers and lipid membranes is discussed.
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Affiliation(s)
- Inga Gabriunaite
- Vilnius University, Faculty of Chemistry and Geosciences, Institute of Chemistry, Department of Physical Chemistry, Vilnius, Lithuania
| | - Ausra Valiuniene
- Vilnius University, Faculty of Chemistry and Geosciences, Institute of Chemistry, Department of Physical Chemistry, Vilnius, Lithuania
| | - Simonas Ramanavicius
- Centre for Physical Sciences and Technology, Department of Electrochemical Material Science, Vilnius, Lithuania
| | - Arunas Ramanavicius
- Vilnius University, Faculty of Chemistry and Geosciences, Institute of Chemistry, Department of Physical Chemistry, Vilnius, Lithuania
- Centre for Physical Sciences and Technology, Department of Electrochemical Material Science, Vilnius, Lithuania
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Abstract
Nanostructured titanium compounds have recently been applied in the design of gas sensors. Among titanium compounds, titanium oxides (TiO2) are the most frequently used in gas sensing devices. Therefore, in this review, we are paying significant attention to the variety of allotropic modifications of titanium oxides, which include anatase, rutile, brukite. Very recently, the applicability of non-stoichiometric titanium oxide (TiO2−x)-based layers for the design of gas sensors was demonstrated. For this reason, in this review, we are addressing some research related to the formation of non-stoichiometric titanium oxide (TiO2−x) and Magnéli phase (TinO2n−1)-based layers suitable for sensor design. The most promising titanium compounds and hetero- and nano-structures based on these compounds are discussed. It is also outlined that during the past decade, many new strategies for the synthesis of TiO2 and conducting polymer-based composite materials were developed, which have found some specific application areas. Therefore, in this review, we are highlighting how specific formation methods, which can be used for the formation of TiO2 and conducting polymer composites, can be applied to tune composite characteristics that are leading towards advanced applications in these specific technological fields. The possibility to tune the sensitivity and selectivity of titanium compound-based sensing layers is addressed. In this review, some other recent reviews related to the development of sensors based on titanium oxides are overviewed. Some designs of titanium-based nanomaterials used for the development of sensors are outlined.
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Enhanced Propanol Response Behavior of ZnFe2O4 NP-Based Active Sensing Layer Induced by Film Thickness Optimization. Processes (Basel) 2021. [DOI: 10.3390/pr9101791] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
Development of gas sensors displaying improved sensing characteristics including sensitivity, selectivity, and stability is now possible owing to tunable surface chemistry of the sensitive layers as well as favorable transport properties. Herein, zinc ferrite (ZnFe2O4) nanoparticles (NPs) were produced using a microwave-assisted hydrothermal method. ZnFe2O4 NP sensing layer films with different thicknesses deposited on interdigitated alumina substrates were fabricated at volumes of 1.0, 1.5, 2.0, and 2.5 µL using a simple and inexpensive drop-casting technique. Successful deposition of ZnFe2O4 NP-based active sensing layer films onto alumina substrates was confirmed by X-ray diffraction and atomic force microscope analysis. Top view and cross-section observations from the scanning electron microscope revealed inter-agglomerate pores within the sensing layers. The ZnFe2O4 NP sensing layer produced at a volume of 2 μL exhibited a high response of 33 towards 40 ppm of propanol, as well as rapid response and recovery times of 11 and 59 s, respectively, at an operating temperature of 120 °C. Furthermore, all sensors demonstrated a good response towards propanol and the highest response against ethanol, methanol, carbon dioxide, carbon monoxide, and methane. The results indicate that the developed fabrication strategy is an inexpensive way to enhance sensing response without sacrificing other sensing characteristics. The produced ZnFe2O4 NP-based active sensing layers can be used for the detection of volatile organic compounds in alcoholic beverages for quality check in the food sector.
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Sagadevan S, Lett JA, Weldegebrieal GK, ud Dowla Biswas MR, Oh WC, Alshahateet SF, Fatimah I, Mohammad F, Al-Lohedan HA, Paiman S, Podder J, Johan MR. Enhanced gas sensing and photocatalytic activity of reduced graphene oxide loaded TiO2 nanoparticles. Chem Phys Lett 2021. [DOI: 10.1016/j.cplett.2021.138897] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Kwon SH, Kim TH, Kim SM, Oh S, Kim KK. Ultraviolet light-emitting diode-assisted highly sensitive room temperature NO 2 gas sensors based on low-temperature solution-processed ZnO/TiO 2 nanorods decorated with plasmonic Au nanoparticles. NANOSCALE 2021; 13:12177-12184. [PMID: 34259295 DOI: 10.1039/d1nr01001h] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Nanostructured semiconducting metal oxides such as SnO2, ZnO, TiO2, and CuO have been widely used to fabricate high performance gas sensors. To improve the sensitivity and stability of gas sensors, we developed NO2 gas sensors composed of ZnO/TiO2 core-shell nanorods (NRs) decorated with Au nanoparticles (NPs) synthesized via a simple low-temperature aqueous solution process, operated under ultraviolet irradiation to realize room temperature operation. The fabricated gas sensor with a 10 nm-thick TiO2 shell layer shows 9 times higher gas sensitivity and faster response and recovery times than ZnO NR-based gas sensors. This high performance of the fabricated gas sensor can be ascribed to band bending between the ZnO and TiO2 core-shell layers and the localized surface plasmon resonance effect of Au NPs with a sufficient Debye length of the TiO2 shell layer.
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Affiliation(s)
- Soon-Hwan Kwon
- Department of Advanced Convergence Technology, Korea Polytechnic University, 237 Sangidaehak-ro, Siheung-si, Geyonggi-do 15073, Republic of Korea.
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Wang H, Ma J, Zhang J, Feng Y, Vijjapu MT, Yuvaraja S, Surya SG, Salama KN, Dong C, Wang Y, Kuang Q, Tshabalala ZP, Motaung DE, Liu X, Yang J, Fu H, Yang X, An X, Zhou S, Zi B, Liu Q, Urso M, Zhang B, Akande AA, Prasad AK, Hung CM, Van Duy N, Hoa ND, Wu K, Zhang C, Kumar R, Kumar M, Kim Y, Wu J, Wu Z, Yang X, Vanalakar SA, Luo J, Kan H, Li M, Jang HW, Orlandi MO, Mirzaei A, Kim HW, Kim SS, Uddin ASMI, Wang J, Xia Y, Wongchoosuk C, Nag A, Mukhopadhyay S, Saxena N, Kumar P, Do JS, Lee JH, Hong S, Jeong Y, Jung G, Shin W, Park J, Bruzzi M, Zhu C, Gerald RE, Huang J. Gas sensing materials roadmap. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2021; 33. [PMID: 33794513 DOI: 10.1088/1361-648x/abf477] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/25/2020] [Accepted: 04/01/2021] [Indexed: 05/14/2023]
Abstract
Gas sensor technology is widely utilized in various areas ranging from home security, environment and air pollution, to industrial production. It also hold great promise in non-invasive exhaled breath detection and an essential device in future internet of things. The past decade has witnessed giant advance in both fundamental research and industrial development of gas sensors, yet current efforts are being explored to achieve better selectivity, higher sensitivity and lower power consumption. The sensing layer in gas sensors have attracted dominant attention in the past research. In addition to the conventional metal oxide semiconductors, emerging nanocomposites and graphene-like two-dimensional materials also have drawn considerable research interest. This inspires us to organize this comprehensive 2020 gas sensing materials roadmap to discuss the current status, state-of-the-art progress, and present and future challenges in various materials that is potentially useful for gas sensors.
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Affiliation(s)
- Huaping Wang
- School of Physics and Electronics, Hunan University, Changsha 410082, People's Republic of China
| | - Jianmin Ma
- School of Physics and Electronics, Hunan University, Changsha 410082, People's Republic of China
| | - Jun Zhang
- College of Physics, Qingdao University, Qingdao 266071, People's Republic of China
| | - Yuezhan Feng
- Key Laboratory of Materials Processing and Mold (Zhengzhou University), Ministry of Education, Zhengzhou University, Zhengzhou, 450002 Henan, People's Republic of China
| | - Mani Teja Vijjapu
- Sensors Lab, Advanced Membranes and Porous Materials Center, Computer, Electrical and Mathematical Science and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia
| | - Saravanan Yuvaraja
- Sensors Lab, Advanced Membranes and Porous Materials Center, Computer, Electrical and Mathematical Science and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia
| | - Sandeep G Surya
- Sensors Lab, Advanced Membranes and Porous Materials Center, Computer, Electrical and Mathematical Science and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia
| | - Khaled N Salama
- Sensors Lab, Advanced Membranes and Porous Materials Center, Computer, Electrical and Mathematical Science and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia
| | - Chengjun Dong
- School of Materials and Energy, Yunnan University, Kunming, People's Republic of China
| | - Yude Wang
- School of Materials and Energy, Yunnan University, Kunming, People's Republic of China
| | - Qin Kuang
- State Key Laboratory of Physical Chemistry of Solid Surfaces, Collaborative Innovation Center of Chemistry for Energy Materials, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, People's Republic of China
| | - Zamaswazi P Tshabalala
- Department of Physics, University of Limpopo, Private Bag X1106, Sovenga 0727, South Africa
| | - David E Motaung
- Department of Physics, University of the Free State, PO Box 339, Bloemfontein ZA9300, South Africa
- Department of Physics, University of Limpopo, Private Bag X1106, Sovenga 0727, South Africa
| | - Xianghong Liu
- College of Physics, Qingdao University, Qingdao 266071, People's Republic of China
| | - Junliang Yang
- School of Physics and Electronics, Central South University, Changsha 410083, People's Republic of China
| | - Haitao Fu
- Key Laboratory for Ecological Metallurgy of Multimetallic Mineral, Northeastern University, Shenyang 110819, People's Republic of China
| | - Xiaohong Yang
- Key Laboratory for Ecological Metallurgy of Multimetallic Mineral, Northeastern University, Shenyang 110819, People's Republic of China
- School of Metallurgy, Northeastern University, Shenyang 110819, People's Republic of China
| | - Xizhong An
- School of Metallurgy, Northeastern University, Shenyang 110819, People's Republic of China
| | - Shiqiang Zhou
- School of Materials Science and Engineering, Yunnan University, Kunming, People's Republic of China
| | - Baoye Zi
- School of Materials Science and Engineering, Yunnan University, Kunming, People's Republic of China
| | - Qingju Liu
- School of Materials Science and Engineering, Yunnan University, Kunming, People's Republic of China
| | - Mario Urso
- IMM-CNR and Dipartimento di Fisica e Astronomia 'Ettore Majorana', Università di Catania, via S Sofia 64, 95123 Catania, Italy
| | - Bo Zhang
- School of Internet of Things Engineering, Jiangnan University, Lihu Avenue 1800#, Wuxi, 214122, People's Republic of China
| | - A A Akande
- Department of Physics, University of Limpopo, Private Bag X1106, Sovenga 0727, South Africa
- Advanced Internet of Things, CSIR NextGen Enterprises and Institutions, PO Box 395, Pretoria, 0001, South Africa
| | - Arun K Prasad
- Indira Gandhi Centre for Atomic Research, Homi Bhabha National Institute, Kalpakkam 603102, India
| | - Chu Manh Hung
- International Training Institute for Materials Science (ITIMS), Hanoi University of Science and Technology (HUST), No 1-Dai Co Viet Str. Hanoi, Vietnam
| | - Nguyen Van Duy
- International Training Institute for Materials Science (ITIMS), Hanoi University of Science and Technology (HUST), No 1-Dai Co Viet Str. Hanoi, Vietnam
| | - Nguyen Duc Hoa
- International Training Institute for Materials Science (ITIMS), Hanoi University of Science and Technology (HUST), No 1-Dai Co Viet Str. Hanoi, Vietnam
| | - Kaidi Wu
- College of Mechanical Engineering, Yangzhou University, People's Republic of China
| | - Chao Zhang
- College of Mechanical Engineering, Yangzhou University, People's Republic of China
| | - Rahul Kumar
- Department of Electrical Engineering, Indian Institute of Technology Jodhpur, Jodhpur 342037, India
| | - Mahesh Kumar
- Department of Electrical Engineering, Indian Institute of Technology Jodhpur, Jodhpur 342037, India
| | - Youngjun Kim
- School of Electrical and Electronic Engineering, Yonsei University, Seoul 120-749, Republic of Korea
| | - Jin Wu
- State Key Laboratory of Optoelectronic Materials and Technologies and the Guangdong Province Key Laboratory of Display Material and Technology, School of Electronics and Information Technology, Sun Yat-sen University, Guangzhou 510275, People's Republic of China
| | - Zixuan Wu
- State Key Laboratory of Optoelectronic Materials and Technologies and the Guangdong Province Key Laboratory of Display Material and Technology, School of Electronics and Information Technology, Sun Yat-sen University, Guangzhou 510275, People's Republic of China
| | - Xing Yang
- State Key Laboratory of Optoelectronic Materials and Technologies and the Guangdong Province Key Laboratory of Display Material and Technology, School of Electronics and Information Technology, Sun Yat-sen University, Guangzhou 510275, People's Republic of China
| | - S A Vanalakar
- Department of Physics, Karmaveer Hire Arts, Science, Commerce and Education College, Gargoti 416-009, India
| | - Jingting Luo
- College of Physics and Optoelectronic Engineering, Shenzhen University, 518060, Shenzhen, People's Republic of China
| | - Hao Kan
- College of Physics and Optoelectronic Engineering, Shenzhen University, 518060, Shenzhen, People's Republic of China
| | - Min Li
- College of Physics and Optoelectronic Engineering, Shenzhen University, 518060, Shenzhen, People's Republic of China
| | - Ho Won Jang
- Department of Materials Science and Engineering, Research Institute of Advanced Materials, Seoul 08826, Republic of Korea
| | - Marcelo Ornaghi Orlandi
- Department of of Engineering, Physics and Mathematics, São Paulo State University (UNESP), Araraquara - SP 14800-060, Brazil
| | - Ali Mirzaei
- Department of Materials Science and Engineering, Shiraz University of Technology, Shiraz, 71557-13876, Iran
| | - Hyoun Woo Kim
- Division of Materials Science and Engineering, Hanyang University, Seoul 04763, Republic of Korea
| | - Sang Sub Kim
- Department of Materials Science and Engineering, Inha University, Incheon 22212, Republic of Korea
| | - A S M Iftekhar Uddin
- Department of Electrical and Electronic Engineering, Metropolitan University, Bateshwar, Sylhet-3103, Bangladesh
| | - Jing Wang
- Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, People's Republic of China
| | - Yi Xia
- Research Center for Analysis and Measurement, Kunming University of Science and Technology, Kunming 650093, People's Republic of China
| | - Chatchawal Wongchoosuk
- Department of Physics, Faculty of Science, Kasetsart University, Chatuchak, Bangkok 10900, Thailand
| | - Anindya Nag
- DGUT-CNAM Institute, Dongguan University of Technology, Dongguan, People's Republic of China
| | | | - Nupur Saxena
- Department of Physics and Astronomical Sciences, Central University of Jammu, Rahya-Suchani, Samba, Jammu, J&K-181143, India
| | - Pragati Kumar
- Department of Nanosciences and Materials, Central University of Jammu, Rahya-Suchani, Samba, Jammu, J & K -181143, India
| | - Jing-Shan Do
- Department of Chemical and Materials Engineering, National Chin-Yi University of Technology, Taichung 41170, Taiwan
| | - Jong-Ho Lee
- Department of Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
| | - Seongbin Hong
- Department of Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
| | - Yujeong Jeong
- Department of Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
| | - Gyuweon Jung
- Department of Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
| | - Wonjun Shin
- Department of Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
| | - Jinwoo Park
- Department of Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
| | - Mara Bruzzi
- Department of Physics and Astronomy, Unviersity of Florence, Via G. Sansone 1, Sesto Fiorentino, Florence, Italy
| | - Chen Zhu
- Department of Electrical and Computer Engineering, Missouri University of Science and Technology, Rolla, MO65409, United States of America
| | - Rex E Gerald
- Department of Electrical and Computer Engineering, Missouri University of Science and Technology, Rolla, MO65409, United States of America
| | - Jie Huang
- Department of Electrical and Computer Engineering, Missouri University of Science and Technology, Rolla, MO65409, United States of America
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Jin Q, Wen W, Zheng S, Jiang R, Wu JM. Branching TiO 2nanowire arrays for enhanced ethanol sensing. NANOTECHNOLOGY 2021; 32:295501. [PMID: 33827055 DOI: 10.1088/1361-6528/abf5a0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/29/2021] [Accepted: 04/06/2021] [Indexed: 05/28/2023]
Abstract
Nanostructure modulation is effective to achieve high performance TiO2-based gas sensors. We herein report a wet-chemistry route to precipitate directly branched TiO2nanowire arrays on alumina tubes for gas sensing applications. The optimized branched TiO2nanowire array exhibits a response of 9.2 towards 100 ppm ethanol; whilst those of the pristine TiO2nanowire array and the branched TiO2nanowire powders randomly distributed are 5.1 and 3.1, respectively. The enhanced response is mainly contributed to the unique porous architecture and quasi-aligned nanostructure, which provide more active sites and also favor gas migration. Phase junctions between the backbone and the branch of the branched TiO2nanowire arrays help the resistance modulation as a result of potential barriers. The facile precipitation of quasi-aligned arrays of branched TiO2nanowires, which arein situgrown on ceramic tubes, thus provides a new economical synthetic route to TiO2-based sensors with excellent properties.
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Affiliation(s)
- Qi Jin
- State Key Laboratory of Silicon Materials and School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, People's Republic of China
| | - Wei Wen
- College of Mechanical and Electrical Engineering, Hainan University, Haikou 570228, People's Republic of China
| | - Shilie Zheng
- College of Information Science and Electronic Engineering, Zhejiang University, Hangzhou 310027, People's Republic of China
| | - Rui Jiang
- Inner Mongolia Metallic Materials Research Institute, Ningbo 315103, People's Republic of China
| | - Jin-Ming Wu
- State Key Laboratory of Silicon Materials and School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, People's Republic of China
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15
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ABDIKADYR B, KILIÇ A, ALEV O, BÜYÜKKÖSE S, ÖZTÜRK ZZ. Enhanced ethanol sensing properties of WO 3 modified TiO 2 nanorods. Turk J Chem 2021; 45:295-306. [PMID: 34104045 PMCID: PMC8164206 DOI: 10.3906/kim-2008-46] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2020] [Accepted: 12/08/2021] [Indexed: 11/30/2022] Open
Abstract
Pristine and WO3 decorated TiO2 nanorods (NRs) were synthesised to investigate n-n-type heterojunction gas sensing properties. TiO2 NRs were fabricated via hydrothermal method on fluorine-doped tin oxide coated glass (FTO) substrates. Then, tungsten was sputtered on the TiO2 NRs and thermally oxidised to obtain WO3 nanoparticles. The heterostructure was characterised by X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy-dispersive X-ray (EDX) spectroscopy. Fabricated sensor devices were exposed to VOCs such as toluene, xylene, acetone and ethanol, and humidity at different operation temperatures. Experimental results demonstrated that the heterostructure has better sensor response toward ethanol at 200 °C. Enhanced sensing properties are attributed to the heterojunction formation by decorating TiO2 NRs with WO3.
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Affiliation(s)
- Bekzat ABDIKADYR
- Department of Physics, Faculty of Science, Gebze Technical University, KocaeliTurkey
| | - Alp KILIÇ
- Department of Physics, Faculty of Science, Gebze Technical University, KocaeliTurkey
| | - Onur ALEV
- Department of Physics, Faculty of Science, Gebze Technical University, KocaeliTurkey
| | - Serkan BÜYÜKKÖSE
- Department of Physics, Faculty of Science, Gebze Technical University, KocaeliTurkey
| | - Zafer Ziya ÖZTÜRK
- Department of Physics, Faculty of Science, Gebze Technical University, KocaeliTurkey
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16
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Rezaee S. The effect of deposition times in DC-magnetron sputtering on micromorphology of TiO 2 thin films. Microsc Res Tech 2021; 84:1475-1483. [PMID: 33491242 DOI: 10.1002/jemt.23703] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2020] [Revised: 12/30/2020] [Accepted: 01/04/2021] [Indexed: 11/11/2022]
Abstract
TiO2 thin films have been prepared by DC-magnetron sputtering process with various deposition times (8, 14, 16, and 20 min) and the micromorphology of their surface has been investigated by means of multifractal analysis. As the main purpose of the manuscript, the topography of all samples are examined by atomic force microscopy (AFM) through the Mountains Map® Premium software which characterizes motifs of significant peaks and pits through stereometric data by the watershed segmentation algorithm. In addition, multifractal features of samples provide deeper insight into texture characteristics and used as the supplementary of the results.
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Affiliation(s)
- Sahar Rezaee
- Department of Physics, Kermanshah Branch, Islamic Azad University, Kermanshah, Iran
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17
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Silver-Deposited Nanoparticles on the Titanium Nanotubes Surface as a Promising Antibacterial Material into Implants. METALS 2021. [DOI: 10.3390/met11010092] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
The main disadvantage of the implants is the associated infections. Therefore, in the long term, the possibility of improving the antibacterial capacity of different types of implants (dental, orthopedic) is being researched. The severity of the problem lies in the increasing bacterial resistance and finding appropriate alternative treatments for infectious diseases, which is an important research field nowadays. The purpose of this review is to draw a parallel between different studies analyzing the antibacterial activity and mechanism of silver nanoparticles (NP Ag) deposited on the titanium nanotubes (NTT), as well as the analysis of the NP Ag toxicity. This review also provides an overview of the synthesis and characterization of TiO2-derived nanotubes (NT). Thus, the analysis aims to present the existing knowledge to better understand the NP Ag implants benefits and their antibacterial activity.
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Ramanavicius S, Ramanavicius A. Insights in the Application of Stoichiometric and Non-Stoichiometric Titanium Oxides for the Design of Sensors for the Determination of Gases and VOCs (TiO 2-x and Ti nO 2n-1 vs. TiO 2). SENSORS (BASEL, SWITZERLAND) 2020; 20:E6833. [PMID: 33260465 PMCID: PMC7730008 DOI: 10.3390/s20236833] [Citation(s) in RCA: 41] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/03/2020] [Revised: 11/23/2020] [Accepted: 11/24/2020] [Indexed: 11/18/2022]
Abstract
In this review article, attention is paid towards the formation of various nanostructured stoichiometric titanium dioxide (TiO2), non-stoichiometric titanium oxide (TiO2-x) and Magnéli phase (TinO2n-1)-based layers, which are suitable for the application in gas and volatile organic compound (VOC) sensors. Some aspects related to variation of sensitivity and selectivity of titanium oxide-based sensors are critically overviewed and discussed. The most promising titanium oxide-based hetero- and nano-structures are outlined. Recent research and many recently available reviews on TiO2-based sensors and some TiO2 synthesis methods are discussed. Some promising directions for the development of TiO2-based sensors, especially those that are capable to operate at relatively low temperatures, are outlined. The applicability of non-stoichiometric titanium oxides in the development of gas and VOC sensors is foreseen and transitions between various titanium oxide states are discussed. The presence of non-stoichiometric titanium oxide and Magnéli phase (TinO2n-1)-based layers in 'self-heating' sensors is predicted, and the advantages and limitations of 'self-heating' gas and VOC sensors, based on TiO2 and TiO2-x/TiO2 heterostructures, are discussed.
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Affiliation(s)
- Simonas Ramanavicius
- Department of Electrochemical Material Science, State Research Institute Center for Physical Sciences and Technology (FTMC), Sauletekio av. 3, LT-10257 Vilnius, Lithuania;
- Department of Physical Chemistry, Faculty of Chemistry and Geosciences, Institute of Chemistry, Vilnius University, Naugarduko 24, LT-03225 Vilnius, Lithuania
| | - Arunas Ramanavicius
- Department of Physical Chemistry, Faculty of Chemistry and Geosciences, Institute of Chemistry, Vilnius University, Naugarduko 24, LT-03225 Vilnius, Lithuania
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Utilization of Nano-TiO 2 as an Influential Additive for Complementing Separation Performance of a Hybrid PVDF-PVP Hollow Fiber: Boron Removal from Leachate. Polymers (Basel) 2020; 12:polym12112511. [PMID: 33126619 PMCID: PMC7693612 DOI: 10.3390/polym12112511] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2020] [Revised: 10/07/2020] [Accepted: 10/10/2020] [Indexed: 12/07/2022] Open
Abstract
The continuous increase in anthropogenic activities resulting in an increase in boron concentration in the environment is becoming a serious threat to public health and the ecosystem. In this regard, a hybrid polyvinylidene fluoride (PVDF)-polyvinyl pyrrolidone (PVP) hollow fiber was synthesized with hydrophilic nano-titanium oxide (TiO2) at varied loadings of 0, 0.5, 1.0, 1.5, and 2.0 wt% using the phase inversion technique. The resultant membranes were characterized in terms of Scanning Electron Microscopy (SEM), Energy Dispersive X-ray Spectroscopy (EDX), contact angle, porosity, and zeta potential. The permeability flux was assessed using both pure water and leachate; also, rejection performance was evaluated based on boron removal from the leachate. The results revealed that the membrane with 1.0 wt% loading had the highest flux alongside an upturn in boron rejection percentage of 223 L/m2·h and 94.39%, respectively. In addition, the lowest contact angle of 50.01° was recorded with 1.0 wt% TiO2 loading, and this implies that it is the most hydrophilic. Throughout the experiment cycles, the fiber with 1.0 wt% TiO2 loading demonstrated a high flux recovery varying between 92.82% and 76.26% after 9 h filtration time. The physicochemical analysis of the permeate revealed that the boron concentration was significantly reduced to 0.43 mg/L, which is far lower than the discharge limit of 1.0 mg/L.
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PbS Quantum Dots Decorating TiO 2 Nanocrystals: Synthesis, Topology, and Optical Properties of the Colloidal Hybrid Architecture. Molecules 2020; 25:molecules25122939. [PMID: 32604749 PMCID: PMC7356616 DOI: 10.3390/molecules25122939] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2020] [Revised: 06/24/2020] [Accepted: 06/24/2020] [Indexed: 11/17/2022] Open
Abstract
Fabrication of heterostructures by merging two or more materials in a single object. The domains at the nanoscale represent a viable strategy to purposely address materials’ properties for applications in several fields such as catalysis, biomedicine, and energy conversion. In this case, solution-phase seeded growth and the hot-injection method are ingeniously combined to fabricate TiO2/PbS heterostructures. The interest in such hybrid nanostructures arises from their absorption properties that make them advantageous candidates as solar cell materials for more efficient solar light harvesting and improved light conversion. Due to the strong lattice mismatch between TiO2 and PbS, the yield of the hybrid structure and the control over its properties are challenging. In this study, a systematic investigation of the heterostructure synthesis as a function of the experimental conditions (such as seeds’ surface chemistry, reaction temperature, and precursor concentration), its topology, structural properties, and optical properties are carried out. The morphological and chemical characterizations confirm the formation of small dots of PbS by decorating the oleylamine surface capped TiO2 nanocrystals under temperature control. Remarkably, structural characterization points out that the formation of heterostructures is accompanied by modification of the crystallinity of the TiO2 domain, which is mainly ascribed to lattice distortion. This result is also confirmed by photoluminescence spectroscopy, which shows intense emission in the visible range. This originated from self-trapped excitons, defects, and trap emissive states.
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Muthuvel A, Jothibas M, Manoharan C, Jayakumar SJ. Synthesis of CeO2-NPs by chemical and biological methods and their photocatalytic, antibacterial and in vitro antioxidant activity. RESEARCH ON CHEMICAL INTERMEDIATES 2020. [DOI: 10.1007/s11164-020-04115-w] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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22
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Choi HJ, Kwon SH, Lee WS, Im KG, Kim TH, Noh BR, Park S, Oh S, Kim KK. Ultraviolet Photoactivated Room Temperature NO 2 Gas Sensor of ZnO Hemitubes and Nanotubes Covered with TiO 2 Nanoparticles. NANOMATERIALS 2020; 10:nano10030462. [PMID: 32143528 PMCID: PMC7153620 DOI: 10.3390/nano10030462] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/31/2020] [Revised: 03/02/2020] [Accepted: 03/03/2020] [Indexed: 11/16/2022]
Abstract
Prolonged exposure to NO2 can cause lung tissue inflammation, bronchiolitis fibrosa obliterans, and silo filler’s disease. In recent years, nanostructured semiconducting metal oxides have been widely used to fabricate gas sensors because of their unique structure and surface-to-volume ratio compared to layered materials. In particular, the different morphologies of ZnO-based nanostructures significantly affect the detection property of NO2 gas sensors. However, because of the large interaction energy of chemisorption (1–10 eV), metal oxide-based gas sensors are typically operated above 100 °C, overcoming the energy limits to attain high sensitivity and fast reaction. High operating temperature negatively affects the reliability and durability of semiconductor-based sensors; at high temperature, the diffusion and sintering effects at the metal oxide grain boundaries are major factors causing undesirable long-term drift problems and preventing stability improvements. Therefore, we demonstrate NO2 gas sensors consisting of ZnO hemitubes (HTs) and nanotubes (NTs) covered with TiO2 nanoparticles (NPs). To operate the gas sensor at room temperature (RT), we measured the gas-sensing properties with ultraviolet illumination onto the active region of the gas sensor for photoactivation instead of conventional thermal activation by heating. The performance of these gas sensors was enhanced by the change of barrier potential at the ZnO/TiO2 interfaces, and their depletion layer was expanded by the NPs formation. The gas sensor based on ZnO HTs showed 1.2 times higher detection property than those consisting of ZnO NTs at the 25 ppm NO2 gas.
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Affiliation(s)
- Hee-Jung Choi
- Department of Advanced Convergence Technology, and Research Institute of Advanced Convergence Technology, Korea Polytechnic University, 237 Sangidaehak-ro, Siheung-si 15073, Korea; (H.-J.C.); (S.-H.K.); (W.-S.L.); (T.-H.K.); (B.-R.N.)
| | - Soon-Hwan Kwon
- Department of Advanced Convergence Technology, and Research Institute of Advanced Convergence Technology, Korea Polytechnic University, 237 Sangidaehak-ro, Siheung-si 15073, Korea; (H.-J.C.); (S.-H.K.); (W.-S.L.); (T.-H.K.); (B.-R.N.)
| | - Won-Seok Lee
- Department of Advanced Convergence Technology, and Research Institute of Advanced Convergence Technology, Korea Polytechnic University, 237 Sangidaehak-ro, Siheung-si 15073, Korea; (H.-J.C.); (S.-H.K.); (W.-S.L.); (T.-H.K.); (B.-R.N.)
| | - Kwang-Gyun Im
- Department of Nano & Semiconductor engineering, Korea Polytechnic University, 237 Sangidaehak-ro, Siheung-si 15073, Korea;
| | - Tae-Hyun Kim
- Department of Advanced Convergence Technology, and Research Institute of Advanced Convergence Technology, Korea Polytechnic University, 237 Sangidaehak-ro, Siheung-si 15073, Korea; (H.-J.C.); (S.-H.K.); (W.-S.L.); (T.-H.K.); (B.-R.N.)
| | - Beom-Rae Noh
- Department of Advanced Convergence Technology, and Research Institute of Advanced Convergence Technology, Korea Polytechnic University, 237 Sangidaehak-ro, Siheung-si 15073, Korea; (H.-J.C.); (S.-H.K.); (W.-S.L.); (T.-H.K.); (B.-R.N.)
| | - Sunghoon Park
- Department of Software Convergence, and 1101B Gwanggeto-Bd, Sejong University, Neungdong-ro, Gwangjin-gu, Seoul 05006, Korea;
| | - Semi Oh
- Department of Electrical Engineering and Computer Science, University of Michigan, 1301 Beal Avenue, Ann Arbor, Michigan 48109, USA
- Correspondence: (S.O.); (K.-K.K.)
| | - Kyoung-Kook Kim
- Department of Advanced Convergence Technology, and Research Institute of Advanced Convergence Technology, Korea Polytechnic University, 237 Sangidaehak-ro, Siheung-si 15073, Korea; (H.-J.C.); (S.-H.K.); (W.-S.L.); (T.-H.K.); (B.-R.N.)
- Department of Nano & Semiconductor engineering, Korea Polytechnic University, 237 Sangidaehak-ro, Siheung-si 15073, Korea;
- Correspondence: (S.O.); (K.-K.K.)
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Liao C, Li Y, Tjong SC. Visible-Light Active Titanium Dioxide Nanomaterials with Bactericidal Properties. NANOMATERIALS (BASEL, SWITZERLAND) 2020; 10:E124. [PMID: 31936581 PMCID: PMC7022691 DOI: 10.3390/nano10010124] [Citation(s) in RCA: 74] [Impact Index Per Article: 18.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/06/2019] [Revised: 01/04/2020] [Accepted: 01/06/2020] [Indexed: 12/16/2022]
Abstract
This article provides an overview of current research into the development, synthesis, photocatalytic bacterial activity, biocompatibility and cytotoxic properties of various visible-light active titanium dioxide (TiO2) nanoparticles (NPs) and their nanocomposites. To achieve antibacterial inactivation under visible light, TiO2 NPs are doped with metal and non-metal elements, modified with carbonaceous nanomaterials, and coupled with other metal oxide semiconductors. Transition metals introduce a localized d-electron state just below the conduction band of TiO2 NPs, thereby narrowing the bandgap and causing a red shift of the optical absorption edge into the visible region. Silver nanoparticles of doped TiO2 NPs experience surface plasmon resonance under visible light excitation, leading to the injection of hot electrons into the conduction band of TiO2 NPs to generate reactive oxygen species (ROS) for bacterial killing. The modification of TiO2 NPs with carbon nanotubes and graphene sheets also achieve the efficient creation of ROS under visible light irradiation. Furthermore, titanium-based alloy implants in orthopedics with enhanced antibacterial activity and biocompatibility can be achieved by forming a surface layer of Ag-doped titania nanotubes. By incorporating TiO2 NPs and Cu-doped TiO2 NPs into chitosan or the textile matrix, the resulting polymer nanocomposites exhibit excellent antimicrobial properties that can have applications as fruit/food wrapping films, self-cleaning fabrics, medical scaffolds and wound dressings. Considering the possible use of visible-light active TiO2 nanomaterials for various applications, their toxicity impact on the environment and public health is also addressed.
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Affiliation(s)
- Chengzhu Liao
- Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China
| | - Yuchao Li
- Department of Materials Science and Engineering, Liaocheng University, Liaocheng 252000, China;
| | - Sie Chin Tjong
- Department of Physics, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong 999077, China
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24
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Ramanavicius S, Tereshchenko A, Karpicz R, Ratautaite V, Bubniene U, Maneikis A, Jagminas A, Ramanavicius A. TiO 2-x/TiO 2-Structure Based 'Self-Heated' Sensor for the Determination of Some Reducing Gases. SENSORS (BASEL, SWITZERLAND) 2019; 20:E74. [PMID: 31877794 PMCID: PMC6982824 DOI: 10.3390/s20010074] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/12/2019] [Revised: 12/10/2019] [Accepted: 12/17/2019] [Indexed: 02/05/2023]
Abstract
In this research we report the gas-sensing properties of TiO2-x/TiO2-based hetero-structure, which was 'self-heated' by current that at constant potential passed through the structure. Amperometric measurements were applied for the evaluation of sensor response towards ethanol, methanol, n-propanol and acetone gases/vapours. The sensitivity towards these gases was based on electrical resistance changes, which were determined by amperometric measurements of current at fixed voltage applied between Pt-based contacts/electrodes deposited on the TiO2-x/TiO2-based layer. X-ray diffraction (XRD) analysis revealed the formation of TiO2-x/TiO2-based hetero-structure, which is mainly based on Ti3O5/TiO2 formed during the hydro-thermal oxidation-based sensing-layer preparation process. Additionally, photoluminescence and time-resolved photoluminescence decay kinetics-based signals of this sensing structure revealed the presence of TiO2 mainly in the anatase phase in the TiO2-x/TiO2-based hetero-structure, which was formed at 400 °C annealing temperature. The evaluation of TiO2-x/TiO2-based gas-sensing layer was performed at several different temperatures (25 °C, 72 °C, 150 °C, 180 °C) and at these temperatures different sensitivity to the aforementioned gaseous materials was determined.
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Affiliation(s)
- Simonas Ramanavicius
- Center for Physical Sciences and Technology, Sauletekio av. 3, LT-10257 Vilnius, Lithuania; (S.R.); (R.K.); (V.R.); (U.B.); (A.M.); (A.J.)
| | - Alla Tereshchenko
- Department of Experimental Physics, Faculty of Mathematics, Physics and Information Technologies, Odesa National I.I. Mechnikov University, Pastera 42, 65023 Odesa, Ukraine;
- Department of Physical Chemistry, Institute of Chemistry, Faculty of Chemistry and Geosciences, Vilnius University, Naugarduko 24, LT-03225 Vilnius, Lithuania
| | - Renata Karpicz
- Center for Physical Sciences and Technology, Sauletekio av. 3, LT-10257 Vilnius, Lithuania; (S.R.); (R.K.); (V.R.); (U.B.); (A.M.); (A.J.)
| | - Vilma Ratautaite
- Center for Physical Sciences and Technology, Sauletekio av. 3, LT-10257 Vilnius, Lithuania; (S.R.); (R.K.); (V.R.); (U.B.); (A.M.); (A.J.)
- Department of Physical Chemistry, Institute of Chemistry, Faculty of Chemistry and Geosciences, Vilnius University, Naugarduko 24, LT-03225 Vilnius, Lithuania
| | - Urte Bubniene
- Center for Physical Sciences and Technology, Sauletekio av. 3, LT-10257 Vilnius, Lithuania; (S.R.); (R.K.); (V.R.); (U.B.); (A.M.); (A.J.)
- Department of Physical Chemistry, Institute of Chemistry, Faculty of Chemistry and Geosciences, Vilnius University, Naugarduko 24, LT-03225 Vilnius, Lithuania
| | - Audrius Maneikis
- Center for Physical Sciences and Technology, Sauletekio av. 3, LT-10257 Vilnius, Lithuania; (S.R.); (R.K.); (V.R.); (U.B.); (A.M.); (A.J.)
| | - Arunas Jagminas
- Center for Physical Sciences and Technology, Sauletekio av. 3, LT-10257 Vilnius, Lithuania; (S.R.); (R.K.); (V.R.); (U.B.); (A.M.); (A.J.)
| | - Arunas Ramanavicius
- Center for Physical Sciences and Technology, Sauletekio av. 3, LT-10257 Vilnius, Lithuania; (S.R.); (R.K.); (V.R.); (U.B.); (A.M.); (A.J.)
- Department of Physical Chemistry, Institute of Chemistry, Faculty of Chemistry and Geosciences, Vilnius University, Naugarduko 24, LT-03225 Vilnius, Lithuania
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25
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Jraba A, Anna Z, Elaloui E. Effects of Sr2+, Fe3+ and Al3+ doping on the properties of TiO2 prepared using the sol–gel method. CR CHIM 2019. [DOI: 10.1016/j.crci.2019.10.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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26
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De Lile J, Kang SG, Son YA, Lee SG. Investigating Polaron Formation in Anatase and Brookite TiO 2 by Density Functional Theory with Hybrid-Functional and DFT + U Methods. ACS OMEGA 2019; 4:8056-8064. [PMID: 31459895 PMCID: PMC6648264 DOI: 10.1021/acsomega.9b00443] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/10/2019] [Accepted: 04/24/2019] [Indexed: 05/31/2023]
Abstract
Anatase and brookite are robust materials with enhanced photocatalytic properties. In this study, we used density functional theory (DFT) with a hybrid functional and the Hubbard on-site potential methods to determine electron- and hole-polaron geometries for anatase and brookite and their energetics. Localized electron and hole polarons were predicted not to form in anatase using DFT with hybrid functionals. In contrast, brookite formed both electron and hole polarons. The brookite electron-polaronic solution exhibits coexisting localized and delocalized states, with hole polarons mainly dispersed on two-coordinated oxygen ions. Hubbard on-site potential testing over the wide 4.0-10 eV range revealed that brookite polarons are formed at U = 6 eV, while anatase polarons are formed at U = 8 eV. The brookite electron polaron was always localized on a single titanium ion under the Hubbard model, whereas the hole polaron was dispersed over four oxygen atoms, consistent with the hybrid DFT studies. The anatase electron polarons were dispersed at lower on-site potentials but were more localized at higher potentials. Both methods predict that brookite has a higher driving force for the formation of polarons than anatase.
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Affiliation(s)
- Jeffrey
Roshan De Lile
- Department
of Organic Material Science and Engineering, Pusan National University, 2 Busandaehak-ro 63beon-gil, Geumjeong-gu, Busan 46241, Republic
of Korea
| | - Sung Gu Kang
- School
of Chemical Engineering, University of Ulsan, 93 Daehak-ro, Nam-gu, Ulsan 44610, Republic
of Korea
| | - Young-A Son
- Department
of Advanced Organic Materials Engineering, Chungnam National University, 220 Gung-dong, Yuseong-gu, Daejeon 305-764, Republic
of Korea
| | - Seung Geol Lee
- Department
of Organic Material Science and Engineering, Pusan National University, 2 Busandaehak-ro 63beon-gil, Geumjeong-gu, Busan 46241, Republic
of Korea
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27
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Harraz FA, Faisal M, Ismail AA, Al-Sayari S, Al-Salami A, Al-Hajry A, Al-Assiri M. TiO2/reduced graphene oxide nanocomposite as efficient ascorbic acid amperometric sensor. J Electroanal Chem (Lausanne) 2019. [DOI: 10.1016/j.jelechem.2018.11.004] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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28
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Raghu AV, Karuppanan KK, Pullithadathil B. Highly Sensitive, Temperature-Independent Oxygen Gas Sensor Based on Anatase TiO 2 Nanoparticle Grafted, 2D Mixed Valent VO x Nanoflakelets. ACS Sens 2018; 3:1811-1821. [PMID: 30160472 DOI: 10.1021/acssensors.8b00544] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Herein, we report a facile approach for the synthesis of TiO2 nanoparticles tethered on 2D mixed valent vanadium oxide (VO x/TiO2) nanoflakelets using a thermal decomposition assisted hydrothermal method and investigation of its temperature-independent performance enhancement in oxygen-sensing properties. The material was structurally characterized using XRD, TEM, Raman, DSC, and XPS analysis. The presence of mixed valent states, such as V2O5 and VO2 in VO x, and the metastable properties of VO2 have been found to play crucial roles in the temperature-independent electrical conductivity of VO x/TiO2 nanoflakelets. Though pristine VO x exhibited characteristic semiconductor-to-metal transition of monoclinic VO2, pure VO x nanoflakelets exhibited poor sensitivity toward sensing oxygen. VO x/TiO2 nanoflakelets showed a very low temperature coefficient of resistance above 150 °C with improved sensitivity (35 times higher than VO x for 100 ppm) toward oxygen gas. VO x/TiO2 nanoflakelets exhibited much higher response, faster adsorption and desorption toward oxygen as compared to pristine VO x beyond 100 °C, which endowed the sensor with excellent temperature-independent sensor properties within 150-500 °C. The faster adsorption and desorption after 100 °C led to shorter response time (3-5 s) and recovery time (7-9 s). The results suggest that 2D VO x/TiO2 can be a promising candidate for temperature-independent oxygen sensor applications.
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Affiliation(s)
| | | | - Biji Pullithadathil
- Nanosensor Laboratory, PSG Institute of Advanced Studies, Coimbatore, 641004, India
- Department of Chemistry, PSG College of Technology, Coimbatore 641004, India
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29
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Relationship of Crystals Shape, Aggregation Mode and Surface Purity in Catalytic Wet Peroxide Oxidation of Phenol in Dark with Titania Anatase Nanocrystals. Catal Letters 2018. [DOI: 10.1007/s10562-018-2557-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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30
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Al-Hussaini AS, Eltabie KR, Hassan MER. Fabrication of core-shell nanocomposites with enhanced photocatalytic efficacy. POLYM INT 2018. [DOI: 10.1002/pi.5662] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Ayman S Al-Hussaini
- Chemistry Department, Faculty of Science; Port Said University; Port Said Egypt
| | - Kareem R Eltabie
- Chemistry Department, Faculty of Science; Port Said University; Port Said Egypt
| | - Mohamed ER Hassan
- Chemistry Department, Faculty of Science; Port Said University; Port Said Egypt
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