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Okechukwu VO, Njobeh PB, Kappo AP, Mamo MA. Room temperature detection of aspergillus flavus volatile organic compounds (VOCs) under simulated conditions using graphene oxide and tin oxide Nanorods (SnO 2 NRs-GO). Food Chem 2024; 456:140068. [PMID: 38878549 DOI: 10.1016/j.foodchem.2024.140068] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2024] [Revised: 06/06/2024] [Accepted: 06/09/2024] [Indexed: 07/24/2024]
Abstract
This study investigated the application of a hybrid nanocomposite of tin oxide nanorods (SnO2 NRs) and graphene oxide (GO) for the chemoresistive detection of some volatile compounds (hexanal, benzaldehyde, octanal, 1-octanol, and ethyl acetate vapours) emitted by Aspergillus flavus under simulated conditions. The synthesised materials were characterised using various analytical techniques, including high-resolution transmission electron microscopy (HR-TEM), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) analysis, and Fourier transform infrared spectroscopy (FTIR). Three sensors were fabricated: individual nanomaterials (i.e., SnO2 and GO) and composites (SnO2-GO). The results showed that SnO2 NRs had limited sensitivity as a sensor, while GO-based sensors responded to various analyte vapours. However, the incorporation of SnO2 NRs into GO layers resulted in synergistic effects and improved sensor performance. The sensors' sensitivity, selectivity, recovery, and response times were quantitatively determined from the sensors' response curves. The nanocomposite sensor demonstrated superior sensitivity and selectivity for analyte vapours with acceptable response and recovery times. In addition, the sensor was insensitive to humidity and showed robust performance up to 62% RH, although sensor drift occurred at 70% RH. This study highlights the promising potential of using SnO2 NRs-GO composite-based sensor for sensitive and selective detection of analyte vapours, which has significant implications for food safety and environmental monitoring applications.
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Affiliation(s)
- Viola O Okechukwu
- Department of Biochemistry, Auckland Park Kingsway Campus, University of Johannesburg, South Africa
| | - Patrick B Njobeh
- Department of Biotechnology and Food Technology, PO Box 17011, Doornfontein Campus, University of Johannesburg, South Africa
| | - Abidemi P Kappo
- Department of Biochemistry, Auckland Park Kingsway Campus, University of Johannesburg, South Africa
| | - Messai A Mamo
- Department of Chemical Sciences, PO Box 2028, Doornfontein Campus, University of Johannesburg, South Africa.
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2
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Tessore F, Pargoletti E, Di Carlo G, Albanese C, Soave R, Trioni MI, Marelli F, Cappelletti G. How the Interplay between SnO 2 and Zn(II) Porphyrins Impacts on the Electronic Features of Gaseous Acetone Chemiresistors. ACS APPLIED MATERIALS & INTERFACES 2024. [PMID: 39049749 DOI: 10.1021/acsami.4c05478] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/27/2024]
Abstract
Herein, the integration of SnO2 nanoparticles with two Zn(II) porphyrins─Zn(II) 5,10,15,20-tetraphenylporphyrin (ZnTPP) and its perfluorinated counterpart, Zn(II) 5,10,15,20-tetrakis(pentafluorophenyl)porphyrin (ZnTPPF20)─was investigated for the sensing of gaseous acetone at 120 °C, adopting three Zn-porphyrin/SnO2 weight ratios (1:4, 1:32, and 1:64). For the first time, we were able to provide evidence of the correlation between the materials' conductivity and these nanocomposites' sensing performances, obtaining optimal results with a 1:32 ratio for ZnTPPF20/SnO2 and showcasing a remarkable detection limit of 200 ppb together with a boosted sensing signal with respect to bare SnO2. To delve deeper, the combination of experimental data with density functional theory calculations unveiled an electron-donating behavior of both porphyrins when interacting with tin dioxide semiconductor, especially for the nonfluorinated one. The study suggested that the interplay between electrons injected, from the porphyrins' highest occupied molecular orbital to SnO2 conduction band, and the latter's available electronic states has a dramatic impact to boost the chemiresistive sensing. Indeed, we highlighted that the key lies in preventing the full saturation of SnO2 electronic states concomitantly increasing the materials' conductivity: in this respect, the best compromise turned out to be the perfluorinated porphyrin. A further corroboration of our findings was obtained by illuminating the sensors during measurements with light-emitting diode (LED) light. Actually, we demonstrated that it does not have any impact on improving the sensing behavior, most probably due to the electronic oversaturation and scattering caused by LED excitation in porphyrins. Lastly, the most effective hybrids (1:32 ratio) were physicochemically characterized, confirming the physisorption of the macrocycles onto the SnO2 surface. In conclusion, herein, we underscore the feasibility of customizing the porphyrin chemistry and porphyrin-to-SnO2 ratio to enhance the gaseous sensing of bare metal oxides, providing valuable insights for the engineering of highly performing light-free chemiresistors.
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Affiliation(s)
- Francesca Tessore
- Dipartimento di Chimica, Università degli Studi di Milano, Golgi 19, 20133 Milan, Italy
- Consorzio Interuniversitario Nazionale per la Scienza e Tecnologia dei Materiali (INSTM), Giusti 9, 50121 Florence, Italy
| | - Eleonora Pargoletti
- Dipartimento di Chimica, Università degli Studi di Milano, Golgi 19, 20133 Milan, Italy
- Consorzio Interuniversitario Nazionale per la Scienza e Tecnologia dei Materiali (INSTM), Giusti 9, 50121 Florence, Italy
| | - Gabriele Di Carlo
- Dipartimento di Chimica, Università degli Studi di Milano, Golgi 19, 20133 Milan, Italy
- Consorzio Interuniversitario Nazionale per la Scienza e Tecnologia dei Materiali (INSTM), Giusti 9, 50121 Florence, Italy
| | - Cecilia Albanese
- Dipartimento di Chimica, Università degli Studi di Milano, Golgi 19, 20133 Milan, Italy
| | - Raffaella Soave
- National Research Council of Italy, Institute of Chemical Sciences and Technologies "Giulio Natta", Golgi 19, 20133 Milan, Italy
| | - Mario Italo Trioni
- National Research Council of Italy, Institute of Chemical Sciences and Technologies "Giulio Natta", Golgi 19, 20133 Milan, Italy
| | - Federica Marelli
- Dipartimento di Chimica, Università degli Studi di Milano, Golgi 19, 20133 Milan, Italy
| | - Giuseppe Cappelletti
- Dipartimento di Chimica, Università degli Studi di Milano, Golgi 19, 20133 Milan, Italy
- Consorzio Interuniversitario Nazionale per la Scienza e Tecnologia dei Materiali (INSTM), Giusti 9, 50121 Florence, Italy
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3
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Baek JW, Han S, Lee SE, Ahn J, Park C, Nam JS, Kim YH, Shin E, Kim M, Jang JS, Kim J, Park HJ, Kim ID. Cobalt-Doped Ceria Sensitizer Effects on Metal Oxide Nanofibers: Heightened Surface Reactivity for High-Performing Chemiresistive Sensors. ACS NANO 2024. [PMID: 39012788 DOI: 10.1021/acsnano.4c03168] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/18/2024]
Abstract
Chemiresistive gas sensors based on semiconducting metal oxides typically rely on noble metal catalysts to enhance their sensitivity and selectivity. However, noble metal catalysts have several drawbacks for practical utilization, including their high cost, their propensity for spontaneous agglomeration, and poisoning effects with certain types of gases. As such, in the interest of commercializing the chemiresistive gas sensor technology, we propose an alternative design for a noble-metal-free sensing material through the case study of Co-doped ceria (Co-CeO2) catalysts embedded in a SnO2 matrix. In this investigation, we utilized electrospinning and subsequent calcination to prepare Co-CeO2 catalyst nanoparticles integrated with SnO2 nanofibers (NFs) with uniform particle distribution and particle size regulation down to the sub-2 nm regime. The resulting Co-CeO2@SnO2 NFs exhibited superior gas sensing characteristics toward isoprene (C5H8) gas, a significant biomarker for monitoring the onset of various diseases through breath diagnostics. In particular, we identified that the Co-CeO2 catalysts, owing to the transition metal doping, facilitated the spillover of chemisorbed oxygen species to the SnO2 sensing body. This resulting in the sensor having a 27.4-fold higher response toward 5 ppm of C5H8 (compared to pristine SnO2), exceptionally high selectivity, and a low detection limit of 100 ppb. The sensor also exhibited high stability for prolonged response-recovery cycles, attesting to the strong anchoring of Co-CeO2 catalysts in the SnO2 matrix. Based on our findings, the transition metal-doped metal oxide catalysts, such as Co-CeO2, demonstrate strong potential to completely replace noble metal catalysts, thereby advancing the development of the commercially viable chemiresistive gas sensors free from noble metals, capable of detecting target gases at sub-ppm levels.
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Affiliation(s)
- Jong Won Baek
- Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea
| | - Seunghee Han
- Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea
| | - Sang Eun Lee
- Department of Materials Science and Engineering, Dankook University, 119 Dandea-ro, Cheonan 31116, Republic of Korea
| | - Jaewan Ahn
- Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea
| | - Chungseong Park
- Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea
| | - Jong Seok Nam
- Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea
| | - Yoon Hwa Kim
- Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea
| | - Euichul Shin
- Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea
| | - Minhyun Kim
- Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea
| | - Ji-Soo Jang
- Electronic Materials Research Center, Korea Institute of Science and Technology, Seoul 02792, Republic of Korea
| | - Jihan Kim
- Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea
| | - Hee Jung Park
- Department of Materials Science and Engineering, Dankook University, 119 Dandea-ro, Cheonan 31116, Republic of Korea
| | - Il-Doo Kim
- Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea
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Banu A, Sinha B, Sikdar S. Synthesis of polymeric 2D-graphitic carbon nitride (g-C 3N 4) nanosheets for sustainable photodegradation of organic pollutants. Heliyon 2024; 10:e33354. [PMID: 39040285 PMCID: PMC11261085 DOI: 10.1016/j.heliyon.2024.e33354] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2024] [Revised: 04/24/2024] [Accepted: 06/19/2024] [Indexed: 07/24/2024] Open
Abstract
A superficial, one step thermal polycondensation method has been employed for the manifestation of graphene like graphitic carbon nitride (g-C3N4) catalyst. The as synthesized g-C3N4 was well characterized by SEM and EDAX analysis, XRD, ATR-IR, FTIR, Fluorescence spectroscopy, Raman spectroscopy and UV-Visible spectroscopy which provide structural, morphological assemblage relating to the structure of g-C3N4. The g-C3N4 showed that an outstanding photochemical stability, morphology, conductive carbon framework and superior photocatalytic activity. The band gap value of g-C3N4 is 2.34 eV determined using Tauc plot. Due to low band gap (2.33 eV) and unique morphology which provides high separation and migration ability of the photogenerated charges, the g-C3N4 shows enhanced photocatalytic activity for the removal of many organic dyes such as Rhodamine B (RhB), Crystal Violet (CV), Methylene Blue (MB), Methyl Orange (MO), Naphthol Orange (NO) and a phenol derivative, p-Nitrophenol (p-NP). Among them, RhB dye was degraded almost 81 % at 90 min under sunlight irradiation in presence g-C3N4 while other dyes and p-NP was degraded at lower rate. From the experimental data, it was found that MO and p-NP degradation rate was least. The rate constant for degradation of Rh B is 1.1 × 10-2 min-1. Therefore, g-C3N4 can be used as an efficient photocatalyst for waste water treatment by the removal of such organic pollutants.
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Affiliation(s)
- Afroja Banu
- Department of Chemistry, University of North Bengal, Darjeeling, 734014, India
- Department of Chemistry, Ghani Khan Choudhury Institute of Engineering and Technology (GKCIET), Narayanpur, Malda, 732141, India
| | - Biswajit Sinha
- Department of Chemistry, University of North Bengal, Darjeeling, 734014, India
| | - Suranjan Sikdar
- Department of Chemistry, Ghani Khan Choudhury Institute of Engineering and Technology (GKCIET), Narayanpur, Malda, 732141, India
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5
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Gopidi HR, Vashist L, Malyi OI. Physics of band-filling correction in defect calculations of solid-state materials. RSC Adv 2024; 14:17675-17683. [PMID: 38836172 PMCID: PMC11148636 DOI: 10.1039/d4ra01528b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2024] [Accepted: 04/16/2024] [Indexed: 06/06/2024] Open
Abstract
In solid-state physics/chemistry, a precise understanding of defect formation and its impact on the electronic properties of wide-bandgap insulators is a cornerstone of modern semiconductor technology. However, complexities arise in the electronic structure theory of defect formation when the latter triggers partial occupation of the conduction/valence band, necessitating accurate post-process correction to the energy calculations. Herein, we dissect these complexities, focusing specifically on the post-process band-filling corrections, a crucial element that often demands thorough treatment in defect formation studies. We recognize the importance of these corrections in maintaining the accuracy of electronic properties predictions in wide-bandgap insulators and their role in reinforcing the importance of a reliable common reference state for defect formation energy calculations. We explored solutions such as aligning deep states and electrostatic potentials, both of which have been used in previous works, showing the effect of band alignment on defect formation energy. Our findings demonstrate that the impact of defect formation on electronic structure (even deep states) can be significantly dependent on the supercell size. We also show that within band-filling calculations, one needs to account for the possible change of electronic structure induced by defect formation, which requires sufficient convergence of electronic structure with supercell size. Thus, this work emphasizes the critical steps to accurately predict defect formation energy and paves the way for future research to overcome these challenges and advance the field with more efficient and reliable predictive models.
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Affiliation(s)
- Harshan Reddy Gopidi
- Centre of Excellence ENSEMBLE3 Sp. z o. o. Wolczynska Str. 133 01-919 Warsaw Poland
| | - Lovelesh Vashist
- Centre of Excellence ENSEMBLE3 Sp. z o. o. Wolczynska Str. 133 01-919 Warsaw Poland
| | - Oleksandr I Malyi
- Qingyuan Innovation Laboratory Quanzhou 362801 P. R. China
- Centre of Excellence ENSEMBLE3 Sp. z o. o. Wolczynska Str. 133 01-919 Warsaw Poland
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6
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Sannino GV, Pecoraro A, Veneri PD, Pavone M, Muñoz-García AB. Effective prediction of SnO 2 conduction band edge potential: The key role of surface oxygen vacancies. J Comput Chem 2024. [PMID: 38795374 DOI: 10.1002/jcc.27434] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2024] [Revised: 04/19/2024] [Accepted: 04/24/2024] [Indexed: 05/27/2024]
Abstract
Several theoretical studies at different levels of theory have attempted to calculate the absolute position of the SnO2 conduction band, whose knowledge is key for its effective application in optoelectronic devices such us, for example, perovskite solar cells. However, the predicted band edges fall outside the experimentally measured range. In this work, we introduce a computational scheme designed to calculate the conduction band minimum values of SnO2, yielding results aligned with experiments. Our analysis points out the fundamental role of encompassing surface oxygen vacancies to properly describe the electronic profile of this material. We explore the impact of both bridge and in-plane oxygen vacancy defects on the structural and electronic properties of SnO2, explaining from an atomistic perspective the experimental observables. The results underscore the importance of simulating both types of defects to accurately predict SnO2 features and provide new fundamental insights that can guide future studies concerning design and optimization of SnO2-based materials and functional interfaces.
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Affiliation(s)
| | - Adriana Pecoraro
- Department of Physics "E. Pancini", University of Naples Federico II, Naples, Italy
| | - Paola Delli Veneri
- Italian National Agency for New Technologies, Energy and Sustainable Economic Development (ENEA), Portici, Italy
| | - Michele Pavone
- Department of Chemical Sciences, University of Naples Federico II, Naples, Italy
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7
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Mirabella DA, Aldao CM. Dependence of n-Type Metal-Oxide Gas Sensor Response on the Pressure of Oxygen and Reducing Gases. ACS Sens 2024; 9:1938-1944. [PMID: 38591496 DOI: 10.1021/acssensors.3c02674] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/10/2024]
Abstract
The adsorption of oxygen and its reaction with target gases are the basis of the gas detection mechanism by using metal oxides. Here, we present a theoretical analysis of the sensor response, within the ionosorption model, for an n-type polycrystalline semiconductor. Our goal of our work is to reveal the mechanisms of gas sensing from a fundamental point of view. We revisit the existing models in which the sensor response presents a power-law behavior with a reducing gas partial pressure. Then, we show, based on the Wolkenstein theory of chemisorption, that the sensor response depends not only on the reducing gas partial pressure but also on the oxygen partial pressure. We also find that the obtained sensor response does not explicitly depend on the grain size, and if it does, it is exclusively through the rate constants related to the involved reactions.
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Affiliation(s)
- Daniel A Mirabella
- Institute of Scientific and Technological Research in Electronics (ICYTE), University of Mar del Plata and National Research Council (CONICET), Juan B. Justo 4302, Mar del Plata B7608FDQ, Argentina
| | - Celso M Aldao
- Institute of Scientific and Technological Research in Electronics (ICYTE), University of Mar del Plata and National Research Council (CONICET), Juan B. Justo 4302, Mar del Plata B7608FDQ, Argentina
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8
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Xie P, Li P, Zhu X, Chen D, Ommati MM, Wang H, Han L, Xu S, Sun P. Hepatotoxic of polystyrene microplastics in aged mice: Focus on the role of gastrointestinal transformation and AMPK/FoxO pathway. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 917:170471. [PMID: 38296072 DOI: 10.1016/j.scitotenv.2024.170471] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/12/2023] [Revised: 01/23/2024] [Accepted: 01/24/2024] [Indexed: 02/05/2024]
Abstract
Microplastic (MP) toxicity has attracted widespread attention, whereas before triggering hepatotoxicity, ingested MPs first undergo transportation and digestion processes in the gastrointestinal tract, possibly interacting with the gastrointestinal contents (GIC). More alarming is the need for more understanding of how this process may impact the liver health of aged animals. This study selected old mice. Firstly, we incubated polystyrene microplastics (PS-MPs, 1 μm) with GIC extract. The results of SEM/EDS indicated a structural alteration in PS-MPs. Additionally, impurities resembling corona, rich in heteroatoms (O, N, and S), were observed. This resulted in an enhanced aggregating phenomenon of MPs. We conducted a 10-day experiment exposing aged mice to four concentrations of PS-MPs, ranging from 1 × 103 to 1 × 1012 particles/L. Subsequent measurements of tissue pathology and body and organ weights were conducted, revealing alterations in liver structure. In the liver, 12 crucial metabolites were found by LC-MS technology, including purines, lipids, and amino acids. The AMPK/FoxO pathway was enriched, activated, and validated in western blotting results. We also comprehensively examined the innate immune system, inflammatory factors, and oxidative stress indicators. The results indicated decreased C3 levels, stable C4 levels, inflammatory factors (IL-6 and IL-8), and antioxidant enzymes were increased to varying degrees. PS-MPs also caused DNA oxidative damage. These toxic effects exhibited a specific dose dependence. Overall, after the formation of the gastrointestinal corona, PS-MPs subsequently impact various cellular processes, such as cycle arrest (p21), leading to hepatic and health crises in the elderly. The presence of gastrointestinal coronas also underscores the MPs' morphology and characteristics, which should be distinguished after ingestion.
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Affiliation(s)
- Pengfei Xie
- College of Animal Science and Technology, Henan University of Science and Technology, Luoyang, Henan 471003, China
| | - Pengcheng Li
- College of Animal Science and Technology, Henan University of Science and Technology, Luoyang, Henan 471003, China
| | - Xiaoshan Zhu
- College of Animal Science and Technology, Henan University of Science and Technology, Luoyang, Henan 471003, China
| | - Deshan Chen
- College of Animal Science and Technology, Henan University of Science and Technology, Luoyang, Henan 471003, China
| | - Mohammad Mehdi Ommati
- College of Animal Science and Technology, Henan University of Science and Technology, Luoyang, Henan 471003, China
| | - Hongwei Wang
- College of Animal Science and Technology, Henan University of Science and Technology, Luoyang, Henan 471003, China
| | - Lei Han
- College of Animal Science and Technology, Henan University of Science and Technology, Luoyang, Henan 471003, China
| | - Shixiao Xu
- Northwest Institute of Plateau Biology Chinese Academy of Sciences, Xining, Qinghai 810008, China
| | - Ping Sun
- College of Animal Science and Technology, Henan University of Science and Technology, Luoyang, Henan 471003, China.
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Kerrami Z, Sibari A, Benaissa M, Kara A. Preferred surface orientation for CO oxidation on SnO 2 surfaces. Phys Chem Chem Phys 2023; 25:24985-24992. [PMID: 37697978 DOI: 10.1039/d3cp00885a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/13/2023]
Abstract
In the present study, we perform a comparative study on the oxidation mechanism of CO gas molecules on SnO2 (110), (101), and (100) surfaces. The optimized adsorption configurations show that the adsorption of CO molecules could occur similarly on the three SnO2 surfaces via two adsorption modes, physisorption of CO on the Sn5c site that is considered as the first step for CO oxidation, followed by CO chemisorption on the O2c site resulting in the formation of CO2 species. Based on the calculated adsorption energies and CO molecule diffusion on SnO2 surfaces, CO molecule adsorption on the (101) surface exhibits the highest adsorption energy and the lowest reaction barrier for CO oxidation compared to the widely considered (110) surface or the (100) surface. These findings are expected to have a major impact on improving sensing properties toward toxic gas by means of surface-orientation engineering.
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Affiliation(s)
- Zineb Kerrami
- LaMCScI, URL-CNRST-17, Faculty of Sciences B.P. 1014, Mohammed V University in Rabat, Rabat 10000, Morocco.
- SPEC, CEA, CNRS, Université Paris-Saclay, CEA Saclay, Gif-sur-Yvette 91191, Cedex, France
| | - Anass Sibari
- LaMCScI, URL-CNRST-17, Faculty of Sciences B.P. 1014, Mohammed V University in Rabat, Rabat 10000, Morocco.
- Centre for Cooperative Research on Alternative Energies (CIC energiGUNE), Basque Research and Technology Alliance (BRTA), 01510, Vitoria-Gasteiz, Spain
| | - Mohammed Benaissa
- LaMCScI, URL-CNRST-17, Faculty of Sciences B.P. 1014, Mohammed V University in Rabat, Rabat 10000, Morocco.
| | - Abdelkader Kara
- Department of Physics, University of Central Florida, Orlando, Florida 32816, USA
- Renewable Energy and Chemical Transformations Cluster, University of Central Florida, Orlando, Florida 32816, USA
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Lai CY, Liu CF, Lin TL, Chen MY, Huang YC, Huang HH, Dong CL, Wang DY, Yeh PH, Wu WW. Defect-Rich SnO 2 Nanofiber as an Oxygen-Defect-Driven Photoenergy Shield against UV Light Cell Damage. ACS APPLIED MATERIALS & INTERFACES 2023; 15:42868-42880. [PMID: 37647236 DOI: 10.1021/acsami.3c08926] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/01/2023]
Abstract
Usually, most studies focus on toxic gas and photosensors by using electrospinning and metal oxide polycrystalline SnO2 nanofibers (PNFs), while fewer studies discuss cell-material interactions and photoelectric effect. In this work, the controllable surface morphology and oxygen defect (VO) structure properties were provided to show the opportunity of metal oxide PNFs to convert photoenergy into bio-energy for bio-material applications. Using the photobiomodulation effect of defect-rich polycrystalline SnO2 nanofibers (PNFs) is the main idea to modulate the cell-material interactions, such as adhesion, growth direction, and reactive oxygen species (ROS) density. The VO structures, including out-of-plane oxygen defects (op-VO), bridge oxygen defects (b-VO), and in-plane oxygen defects (ip-VO), were studied using synchrotron analysis to investigate the electron transfer between the VO structures and conduction bands. These intragrain VO structures can be treated as generation-recombination centers, which can convert various photoenergies (365-520 nm) into different current levels that form distinct surface potential levels; this is referred to as the photoelectric effect. PNF conductivity was enhanced 53.6-fold by enlarging the grain size (410 nm2) by increasing the annealing temperature, which can improve the photoelectric effect. In vitro removal of reactive oxygen species (ROS) can be achieved by using the photoelectric effect of PNFs. Also, the viability and shape of human bone marrow mesenchymal stem cells (hMSCs-BM) were also influenced significantly by the photobiomodulation effect. The cell damage and survival rate can be prevented and enhanced by using PNFs; metal oxide nanofibers are no longer only environmental sensors but can also be a bio-material to convert the photoenergy into bio-energy for biomedical science applications.
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Affiliation(s)
- Chun-Yen Lai
- Department of Materials Science and Engineering, National Yang Ming Chiao Tung University, Hsinchu 30010, Taiwan
| | - Chia-Fei Liu
- Department of Dentistry, National Yang Ming Chiao Tung University, Taipei 11221, Taiwan
| | - Tzu-Ling Lin
- Department of Physics, Tamkang University, New Taipei 25137, Taiwan
| | - Mei-Yu Chen
- Department of Physics, Tamkang University, New Taipei 25137, Taiwan
| | - Yu-Cheng Huang
- Department of Electrophysics, National Yang Ming Chiao Tung University, Hsinchu 30010, Taiwan
| | - Her-Hsiung Huang
- Department of Dentistry, National Yang Ming Chiao Tung University, Taipei 11221, Taiwan
| | - Chung-Li Dong
- Department of Physics, Tamkang University, New Taipei 25137, Taiwan
| | - Ding-Yeong Wang
- Department of Electrical Engineering, Feng Chia University, Taichung 407802, Taiwan
| | - Ping-Hung Yeh
- Department of Physics, Tamkang University, New Taipei 25137, Taiwan
| | - Wen-Wei Wu
- Department of Materials Science and Engineering, National Yang Ming Chiao Tung University, Hsinchu 30010, Taiwan
- Center for the Intelligent Semiconductor Nano-system Technology Research, Hsinchu 30078, Taiwan
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11
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Vasiliev A, Shaposhnik A, Moskalev P, Kul O. Kinetics of Chemisorption on the Surface of Nanodispersed SnO 2-PdO x and Selective Determination of CO and H 2 in Air. SENSORS (BASEL, SWITZERLAND) 2023; 23:3730. [PMID: 37050790 PMCID: PMC10098857 DOI: 10.3390/s23073730] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/05/2023] [Revised: 03/28/2023] [Accepted: 03/30/2023] [Indexed: 06/19/2023]
Abstract
In this work, the kinetics and mechanisms of the interaction of carbon monoxide and hydrogen with the surface of a nanosized SnO2-PdOx metal oxide material in air is studied. Non-stationary temperature regimes make it possible to better identify the individual characteristics of target gases and increase the selectivity of the analysis. Recently, chemometric methods (PCA, PLS, ANN, etc.) are often used to interpret multidimensional data obtained in non-stationary temperature regimes, but the analytical solution of kinetic equations can be no less effective. In this regard, we studied the kinetics of the interaction of carbon monoxide and hydrogen with atmospheric oxygen on the surface of SnO2-PdOx using semiconductor metal oxide sensors under conditions as close as possible to classical gas analysis. An analysis of the influence of catalytic surface temperature on the mechanisms of chemisorption processes allowed us to correctly interpret and mathematically describe the electrophysical characteristics of the sensor in the selective determination of carbon monoxide and hydrogen under nonstationary temperature conditions. The reaction mechanism is applied as well to the analysis of the operation scheme of the CO sensor TGS 2442 of Figaro Inc.
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Affiliation(s)
- Alexey Vasiliev
- Department of Natural Sciences and Engineering, Dubna State University, 143407 Dubna, Russia
| | - Alexey Shaposhnik
- Department of Chemistry, Voronezh State Agrarian University, 394087 Voronezh, Russia
| | - Pavel Moskalev
- Department of Applied Mathematics and Mechanics, Voronezh State Technical University, 394006 Voronezh, Russia
| | - Oleg Kul
- C-Component, LLC, 125362 Moscow, Russia
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Chizhov A, Kutukov P, Astafiev A, Rumyantseva M. Photoactivated Processes on the Surface of Metal Oxides and Gas Sensitivity to Oxygen. SENSORS (BASEL, SWITZERLAND) 2023; 23:s23031055. [PMID: 36772093 PMCID: PMC9919573 DOI: 10.3390/s23031055] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/26/2022] [Revised: 01/10/2023] [Accepted: 01/13/2023] [Indexed: 06/01/2023]
Abstract
Photoactivation by UV and visible radiation is a promising approach for the development of semiconductor gas sensors with reduced power consumption, high sensitivity, and stability. Although many hopeful results were achieved in this direction, the theoretical basis for the processes responsible for the photoactivated gas sensitivity still needs to be clarified. In this work, we investigated the mechanisms of UV-activated processes on the surface of nanocrystalline ZnO, In2O3, and SnO2 by in situ mass spectrometry and compared the obtained results with the gas sensitivity to oxygen in the dark and at UV irradiation. The results revealed a correlation between the photoactivated oxygen isotopic exchange activity and UV-activated oxygen gas sensitivity of the studied metal oxides. To interpret the data obtained, a model was proposed based on the idea of the generation of additional oxygen vacancies under UV irradiation due to the interaction with photoexcited holes.
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Affiliation(s)
- Artem Chizhov
- Chemistry Department, Moscow State University, 119991 Moscow, Russia
| | - Pavel Kutukov
- Chemistry Department, Moscow State University, 119991 Moscow, Russia
| | - Artyom Astafiev
- N.N. Semenov Federal Research Center for Chemical Physics of Russian Academy of Sciences, 119991 Moscow, Russia
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Aziz NA, Abdullah MF, Badaruddin SAM, Hussin MRM, Hashim AM. Highly Sensitive Sub-ppm CH 3COOH Detection by Improved Assembly of Sn 3O 4-RGO Nanocomposite. Molecules 2022; 27:molecules27248707. [PMID: 36557839 PMCID: PMC9783866 DOI: 10.3390/molecules27248707] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2022] [Revised: 11/25/2022] [Accepted: 11/29/2022] [Indexed: 12/13/2022] Open
Abstract
Detection of sub-ppm acetic acid (CH3COOH) is in demand for environmental gas monitoring. In this article, we propose a CH3COOH gas sensor based on Sn3O4 and reduced graphene oxide (RGO), where the assembly of Sn3O4-RGO nanocomposites is dependent on the synthesis method. Three nanocomposites prepared by three different synthesis methods are investigated. The optimum assembly is by hydrothermal reactions of Sn4+ salts and pre-reduced RGO (designated as RS nanocomposite). Raman spectra verified the fingerprint of RGO in the synthesized RS nanocomposite. The Sn3O4 planes of (111), (210), (130), (13¯2) are observed from the X-ray diffractogram, and its average crystallite size is 3.94 nm. X-ray photoelectron spectroscopy on Sn3d and O1s spectra confirm the stoichiometry of Sn3O4 with Sn:O ratio = 0.76. Sn3O4-RGO-RS exhibits the highest response of 74% and 4% at 2 and 0.3 ppm, respectively. The sensitivity within sub-ppm CH3COOH is 64%/ppm. Its superior sensing performance is owing to the embedded and uniformly wrapped Sn3O4 nanoparticles on RGO sheets. This allows a massive relative change in electron concentration at the Sn3O4-RGO heterojunction during the on/off exposure of CH3COOH. Additionally, the operation is performed at room temperature, possesses good repeatability, and consumes only ~4 µW, and is a step closer to the development of a commercial CH3COOH sensor.
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Affiliation(s)
- Norazreen Abd Aziz
- Faculty of Engineering & Built Environment, Universiti Kebangsaan Malaysia, Bangi 43600, Malaysia
- MIMOS Semiconductor (M) Sdn Bhd, Technology Park Malaysia, Kuala Lumpur 57000, Malaysia
- Correspondence:
| | - Mohd Faizol Abdullah
- MIMOS Semiconductor (M) Sdn Bhd, Technology Park Malaysia, Kuala Lumpur 57000, Malaysia
| | | | - Mohd Rofei Mat Hussin
- MIMOS Semiconductor (M) Sdn Bhd, Technology Park Malaysia, Kuala Lumpur 57000, Malaysia
| | - Abdul Manaf Hashim
- Malaysia-Japan International Institute of Technology, Universiti Teknologi Malaysia, Jalan Sultan Yahya Petra, Kuala Lumpur 54100, Malaysia
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Nanosheet-type tin oxide gas sensor array for mental stress monitoring. Sci Rep 2022; 12:13874. [PMID: 36008450 PMCID: PMC9411192 DOI: 10.1038/s41598-022-18117-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2022] [Accepted: 08/05/2022] [Indexed: 11/24/2022] Open
Abstract
Mental stress management has become significantly important because excessive and sustained mental stress can damage human health. In recent years, various biomarkers associated with mental stress have been identified. One such biomarker is allyl mercaptan. A nanosheet-type tin oxide exhibited high gas selectivity for allyl mercaptan; thus, in this study, a sensor array comprising nanosheet-type tin oxide gas sensors was fabricated to detecting allyl mercaptan. Supervised learning algorithms were use to build gas classification models based on the principal component analysis of the sensor signal responses from the sensor array. The comprehensive data provided by the classification models can be used to forecast allyl mercaptan with high accuracy.
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15
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Zhao L, Gong X, Tao W, Wang T, Sun P, Liu F, Liang X, Liu F, Wang Y, Lu G. Understanding the Increasing Trend of Sensor Signal with Decreasing Oxygen Partial Pressure by a Sensing-Reaction Model Based on O 2- Species. ACS Sens 2022; 7:1095-1104. [PMID: 35349276 DOI: 10.1021/acssensors.1c02753] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Although the increasing trend of sensor signal with decreasing oxygen partial pressure was observed quite early, the underlying mechanism is still elusive, which is a hindrance to accurate gas detection under varying oxygen partial pressure. In this work, a sensing model based on previous experimental and theoretical results is proposed, in which the O2- species is determined to be the main oxygen species because O- species has not been observed by direct spectroscopic studies. On this basis, combined with the band bending of SnO2 at different oxygen partial pressures, the functional relationship between the surface electron concentration, oxygen partial pressure, and reducing gas concentration is established, which includes three forms corresponding to the depletion layer, accumulation layer, and flat band. In the depletion layer case, the variation of the sensor resistance to different concentrations of CO and oxygen can be well fitted with our function model. Besides, this model predicts that the response of sensors will no longer maintain the increasing trend in an extremely hypoxic atmosphere but will decrease and approach 1 with the background oxygen content further going down to 0.
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Affiliation(s)
- Liupeng Zhao
- State Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, China
| | - Xueqin Gong
- State Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, China
| | - Wei Tao
- State Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, China
| | - Tianshuang Wang
- State Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, China
| | - Peng Sun
- State Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, China
| | - Fangmeng Liu
- State Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, China
| | - Xishuang Liang
- State Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, China
| | - Fengmin Liu
- State Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, China
| | - Yanchao Wang
- State Key Laboratory of Superhard Materials and International Center of Computational Method and Software, College of Physics, Jilin University, Changchun 130012, China
| | - Geyu Lu
- State Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, China
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Blackman C. Do We Need "Ionosorbed" Oxygen Species? (Or, "A Surface Conductivity Model of Gas Sensitivity in Metal Oxides Based on Variable Surface Oxygen Vacancy Concentration"). ACS Sens 2021; 6:3509-3516. [PMID: 34570973 DOI: 10.1021/acssensors.1c01727] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The author provides an opinion on direct experimental evidence available to support the "ionosorption theory" often employed to interpret "electrophysical" measurements made during a gas sensing experiment. This article then aims to provide an alternative framework of a "surface conductivity" model based on recent advances in theoretical and experimental investigations in solid state physics, and to use this framework as a guide toward design rules for future improvement of gas sensor performance.
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Affiliation(s)
- Christopher Blackman
- Department of Chemistry, University College London, 20 Gordon Street, London, WC1H 0AJ, United Kingdom
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Abstract
Historically, in gas sensing literature, the focus on “mechanisms” has been on oxygen species chemisorbed (ionosorbed) from the ambient atmosphere, but what these species actually represent and the location of the adsorption site on the surface of the solid are typically not well described. Recent advances in computational modelling and experimental surface science provide insights on the likely mechanism by which oxygen and other species interact with the surface of SnO2, providing insight into future directions for materials design and optimisation. This article reviews the proposed models of adsorption and reaction of oxygen on SnO2, including a summary of conventional evidence for oxygen ionosorption and recent operando spectroscopy studies of the atomistic interactions on the surface. The analysis is extended to include common target and interfering reducing gases, such as CO and H2, cross-interactions with H2O vapour, and NO2 as an example of an oxidising gas. We emphasise the importance of the surface oxygen vacancies as both the preferred adsorption site of many gases and in the self-doping mechanism of SnO2.
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