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Wieser P, Moser D, Gollas B, Amenitsch H. Monitoring of Pore Orientation by in Operando Grazing Incidence Small-Angle X-ray Scattering during Templated Electrodeposition of Mesoporous Pt Films. ACS APPLIED MATERIALS & INTERFACES 2023; 15:47604-47614. [PMID: 37769130 PMCID: PMC10571001 DOI: 10.1021/acsami.3c03316] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/07/2023] [Accepted: 09/11/2023] [Indexed: 09/30/2023]
Abstract
We have used in operando grazing incidence small-angle X-ray scattering (GISAXS) to monitor structural changes during templated electrodeposition of mesoporous platinum films on gold electrodes from a ternary lyotropic liquid crystalline mixture of aqueous hexachloroplatinic acid and the diblock copolymer surfactant Brij56. While the cylindrical micelles of the lyotropic liquid crystal (LLC) in the hexagonal phase have a center-to-center distance of 7.5 nm with a preferential alignment parallel to the electrode surface, the electrodeposited platinum films contain highly ordered mesopores arranged in a 2D hexagonal structure, with a center-to-center distance of about 8.5 nm and a preferential orientation perpendicular to the electrode surface. The progression of structural changes of the LLC template and the deposited mesoporous Pt could be monitored for the first time in operando by GISAXS: within the first 14 s of deposition, a nucleation burst of Pt coincides with a loss of preferential alignment of the LLC. Initially, the morphology of the 2-dimensionally nucleated Pt replicates the Au substrate. During the following 5 to 7 min, the growth morphology of the Pt film changes, and vertically aligned mesopores form. Our results indicate mutual interaction between the species involved in the electrodeposition and the LLC template, leading to a partial loss of horizontal orientation of the LLC during Pt nucleation before vertical rearrangement of the micelles to the electrode surface. The vertically aligned mesopores in the Pt and the possibility to produce freestanding films make these materials interesting in fields such as electrocatalysis, energy harvesting, and nanofluidics.
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Affiliation(s)
- Philipp
Aldo Wieser
- Institute
of Inorganic Chemistry, Graz University
of Technology, Graz 8010, Austria
| | - David Moser
- Institute
of Electron Microscopy and Nanoanalysis, Graz University of Technology, Graz 8010, Austria
| | - Bernhard Gollas
- Institute
for Chemistry and Technology of Materials, Graz University of Technology, Graz 8010, Austria
| | - Heinz Amenitsch
- Institute
of Inorganic Chemistry, Graz University
of Technology, Graz 8010, Austria
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2
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Berkal MA, Nardin C. Pesticide biosensors: trends and progresses. Anal Bioanal Chem 2023; 415:5899-5924. [PMID: 37668672 DOI: 10.1007/s00216-023-04911-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2023] [Revised: 08/08/2023] [Accepted: 08/10/2023] [Indexed: 09/06/2023]
Abstract
Pesticides, chemical substances extensively employed in agriculture to optimize crop yields, pose potential risks to human and environmental health. Consequently, regulatory frameworks are in place to restrict pesticide residue concentrations in water intended for human consumption. These regulations are implemented to safeguard consumer safety and mitigate any adverse effects on the environment and public health. Although gas chromatography- and liquid chromatography-mass spectrometry (GC-MS and LC-MS) are highly efficient techniques for pesticide quantification, their use is not suitable for real-time monitoring due to the need for sophisticated laboratory pretreatment of samples prior to analysis. Since they would enable analyte detection with selectivity and sensitivity without sample pretreatment, biosensors appear as a promising alternative. These consist of a bioreceptor allowing for specific recognition of the target and of a detection platform, which translates the biological interaction into a measurable signal. As early detection systems remain urgently needed to promptly alert and act in case of pollution, we review here the biosensors described in the literature for pesticide detection to advance their development for use in the field.
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Affiliation(s)
| | - Corinne Nardin
- Universite de Pau Et Des Pays de L'Adour, E2S UPPA, CNRS, IPREM, Pau, France.
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3
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Wen L, Wang J, Liu Z, Tao CA, Rao J, Hang J, Li Y. A portable acetylcholinesterase-based electrochemical sensor for field detection of organophosphorus. RSC Adv 2023; 13:6389-6395. [PMID: 36874943 PMCID: PMC9982831 DOI: 10.1039/d2ra05383g] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2022] [Accepted: 01/23/2023] [Indexed: 03/06/2023] Open
Abstract
A portable acetylcholinesterase (AChE)-based electrochemical sensor based on a screen-printed carbon electrode (SPCE) and a miniature potentiostat was constructed for the rapid field detection of organophosphorus pesticides (OPs). Graphene (GR) and gold nanoparticles (AuNPs) were successively introduced onto SPCE for surface modification. Due to the synergistic effect of the two nanomaterials, the signal of the sensor has a significant enhancement. Take isocarbophos (ICP) as a model for chemical warfare agents (CAWs) and Ops; the SPCE/GR/AuNPs/AChE/Nafion sensor shows a wider linear range (0.1-2000 μg L-1), and a lower limit of detection (0.012 μg L-1) than SPCE/AChE/Nafion and SPCE/GR/AChE/Nafion sensors. Tests in actual fruit and tap water samples also yielded satisfactory results. Therefore, the proposed method can be used as a simple and cost-effective strategy for construction of portable electrochemical sensors for OP field detection.
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Affiliation(s)
- Long Wen
- College of Science, National University of Defense Technology Changsha 410073 P. R. China
| | - Jianfang Wang
- College of Science, National University of Defense Technology Changsha 410073 P. R. China
| | - Zhuoliang Liu
- College of Science, National University of Defense Technology Changsha 410073 P. R. China
| | - Cheng-An Tao
- College of Science, National University of Defense Technology Changsha 410073 P. R. China
| | - Jialing Rao
- College of Science, National University of Defense Technology Changsha 410073 P. R. China
| | - Jian Hang
- College of Science, National University of Defense Technology Changsha 410073 P. R. China
| | - Yujiao Li
- College of Science, National University of Defense Technology Changsha 410073 P. R. China
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Khosropour H, Kalambate PK, Kalambate RP, Permpoka K, Zhou X, Chen GY, Laiwattanapaisal W. A comprehensive review on electrochemical and optical aptasensors for organophosphorus pesticides. Mikrochim Acta 2022; 189:362. [PMID: 36044085 DOI: 10.1007/s00604-022-05399-y] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2022] [Accepted: 07/01/2022] [Indexed: 12/07/2022]
Abstract
There has been a rise in pesticide use as a result of the growing industrialization of agriculture. Organophosphorus pesticides have been widely applied as agricultural and domestic pest control agents for nearly five decades, and they remain as health and environmental hazards in water supplies, vegetables, fruits, and processed foods causing serious foodborne illness. Thus, the rapid and reliable detection of these harmful organophosphorus toxins with excellent sensitivity and selectivity is of utmost importance. Aptasensors are biosensors based on aptamers, which exhibit exceptional recognition capability for a variety of targets. Aptasensors offer numerous advantages over conventional approaches, including increased sensitivity, selectivity, design flexibility, and cost-effectiveness. As a result, interest in developing aptasensors continues to expand. This paper discusses the historical and modern advancements of aptasensors through the use of nanotechnology to enhance the signal, resulting in high sensitivity and detection accuracy. More importantly, this review summarizes the principles and strategies underlying different organophosphorus aptasensors, including electrochemical, electrochemiluminescent, fluorescent, and colorimetric ones.
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Affiliation(s)
- Hossein Khosropour
- Department of Clinical Chemistry, Faculty of Allied Health Sciences, Chulalongkorn University, Bangkok, 10330, Thailand.
- Biosensors and Bioanalytical Technology for Cells and Innovative Testing Device Research Unit, Chulalongkorn University, Bangkok, 10330, Thailand.
| | - Pramod K Kalambate
- Department of Clinical Chemistry, Faculty of Allied Health Sciences, Chulalongkorn University, Bangkok, 10330, Thailand
- Biosensors and Bioanalytical Technology for Cells and Innovative Testing Device Research Unit, Chulalongkorn University, Bangkok, 10330, Thailand
| | - Rupali P Kalambate
- Department of Clinical Chemistry, Faculty of Allied Health Sciences, Chulalongkorn University, Bangkok, 10330, Thailand
- Biosensors and Bioanalytical Technology for Cells and Innovative Testing Device Research Unit, Chulalongkorn University, Bangkok, 10330, Thailand
| | - Khageephun Permpoka
- Department of Clinical Chemistry, Faculty of Allied Health Sciences, Chulalongkorn University, Bangkok, 10330, Thailand
- Biosensors and Bioanalytical Technology for Cells and Innovative Testing Device Research Unit, Chulalongkorn University, Bangkok, 10330, Thailand
| | - Xiaohong Zhou
- School of Environment, Tsinghua University, Beijing, 100084, China
| | - George Y Chen
- Shenzhen Key Laboratory of Photonic Devices and Sensing Systems for Internet of Things, Guangdong and Hong Kong Joint Research Centre for Optical Fibre Sensors, Shenzhen University, Shenzhen, 518060, China
| | - Wanida Laiwattanapaisal
- Department of Clinical Chemistry, Faculty of Allied Health Sciences, Chulalongkorn University, Bangkok, 10330, Thailand.
- Biosensors and Bioanalytical Technology for Cells and Innovative Testing Device Research Unit, Chulalongkorn University, Bangkok, 10330, Thailand.
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Recent Advances in Nanomaterial-Based Biosensors for Pesticide Detection in Foods. BIOSENSORS 2022; 12:bios12080572. [PMID: 36004968 PMCID: PMC9405907 DOI: 10.3390/bios12080572] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/14/2022] [Revised: 07/08/2022] [Accepted: 07/18/2022] [Indexed: 11/16/2022]
Abstract
Biosensors are a simple, low-cost, and reliable way to detect pesticides in food matrices to ensure consumer food safety. This systematic review lists which nanomaterials, biorecognition materials, transduction methods, pesticides, and foods have recently been studied with biosensors associated with analytical performance. A systematic search was performed in the Scopus (n = 388), Web of Science (n = 790), and Science Direct (n = 181) databases over the period 2016–2021. After checking the eligibility criteria, 57 articles were considered in this study. The most common use of nanomaterials (NMs) in these selected studies is noble metals in isolation, such as gold and silver, with 8.47% and 6.68%, respectively, followed by carbon-based NMs, with 20.34%, and nanohybrids, with 47.45%, which combine two or more NMs, uniting unique properties of each material involved, especially the noble metals. Regarding the types of transducers, the most used were electrochemical, fluorescent, and colorimetric, representing 71.18%, 13.55%, and 8.47%, respectively. The sensitivity of the biosensor is directly connected to the choice of NM and transducer. All biosensors developed in the selected investigations had a limit of detection (LODs) lower than the Codex Alimentarius maximum residue limit and were efficient in detecting pesticides in food. The pesticides malathion, chlorpyrifos, and paraoxon have received the greatest attention for their effects on various food matrices, primarily fruits, vegetables, and their derivatives. Finally, we discuss studies that used biosensor detection systems devices and those that could detect multi-residues in the field as a low-cost and rapid technique, particularly in areas with limited resources.
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Zhao Y, Lu X, Gao F. A stable enzyme sensor via embedding enzymes into zeolitic imidazolate frameworks for pesticide determination. Anal Biochem 2022; 646:114628. [DOI: 10.1016/j.ab.2022.114628] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2021] [Revised: 02/14/2022] [Accepted: 02/22/2022] [Indexed: 11/29/2022]
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7
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Recent advances of enzyme biosensors for pesticide detection in foods. JOURNAL OF FOOD MEASUREMENT AND CHARACTERIZATION 2021. [DOI: 10.1007/s11694-021-01032-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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8
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Xie Y, Liu T, Chu Z, Jin W. Recent advances in electrochemical enzymatic biosensors based on regular nanostructured materials. J Electroanal Chem (Lausanne) 2021. [DOI: 10.1016/j.jelechem.2021.115328] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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9
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Zhang J, Hu H, Wang P, Zhang C, Wu M, Yang L. A stable biosensor for organophosphorus pesticide detection based on chitosan modified graphene. Biotechnol Appl Biochem 2021; 69:567-575. [PMID: 33660328 DOI: 10.1002/bab.2133] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2020] [Accepted: 02/05/2021] [Indexed: 01/15/2023]
Abstract
An acetylcholinesterase (AChE) biosensor was successfully fabricated with a stable structure and high detection accuracy. Graphene (Gra) nanofragments modified with chitosan (CS) and AChE were successively drip coated on the surface of a glassy carbon electrode via a layer-by-layer assembly method. The concentration range of the sensor to detect dichlorvos was 0.1-100,000 nM, and the limit of detection was 54 pM. CS was used to modify Gra for the first time, which enhanced the mechanical flexibility of these Gra nanostructures, significantly improving the stability and detection accuracy of this sensor.
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Affiliation(s)
- Jianhua Zhang
- Key Laboratory of Advanced Display and System Applications, Ministry of Education, Shanghai University, Shanghai, China
| | - Huaying Hu
- Key Laboratory of Advanced Display and System Applications, Ministry of Education, Shanghai University, Shanghai, China
| | - Pengchang Wang
- Key Laboratory of Advanced Display and System Applications, Ministry of Education, Shanghai University, Shanghai, China
| | - Chi Zhang
- Key Laboratory of Advanced Display and System Applications, Ministry of Education, Shanghai University, Shanghai, China
| | - Majiaqi Wu
- Key Laboratory of Advanced Display and System Applications, Ministry of Education, Shanghai University, Shanghai, China
| | - Lianqiao Yang
- Key Laboratory of Advanced Display and System Applications, Ministry of Education, Shanghai University, Shanghai, China
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10
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Electrochemically synthesized superhydrophilic 3D tree-like Ag microstructure for ultrasensitive detection of omethoate. Microchem J 2020. [DOI: 10.1016/j.microc.2020.105427] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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11
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Wang W, Wang X, Cheng N, Luo Y, Lin Y, Xu W, Du D. Recent advances in nanomaterials-based electrochemical (bio)sensors for pesticides detection. Trends Analyt Chem 2020. [DOI: 10.1016/j.trac.2020.116041] [Citation(s) in RCA: 58] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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12
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A universal approach for the synthesis of mesoporous gold, palladium and platinum films for applications in electrocatalysis. Nat Protoc 2020; 15:2980-3008. [PMID: 32839575 DOI: 10.1038/s41596-020-0359-8] [Citation(s) in RCA: 31] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2019] [Accepted: 05/20/2020] [Indexed: 01/10/2023]
Abstract
High-surface-area mesoporous materials expose abundant functional sites for improved performance in applications such as gas storage/separation, catalysis, and sensing. Recently, soft templates composed of amphiphilic surfactants and block copolymers have been used to introduce mesoporosity in various materials, including metals, metal oxides and carbonaceous compounds. In particular, mesoporous metals are attractive in electrocatalysis because their porous networks expose numerous unsaturated atoms on high-index facets that are highly active in catalysis. In this protocol, we describe how to create mesoporous metal films composed of gold, palladium, or platinum using block copolymer micelle templates. The amphiphilic block copolymer micelles are the sacrificial templates and generate uniform structures with tunable pore sizes in electrodeposited metal films. The procedure describes the electrodeposition in detail, including parameters such as micelle diameters, deposition potentials, and deposition times to ensure reproducibility. The micelle diameters can be controlled by swelling the micelles with different solvent mixtures or by using block copolymer micelles with different molecular weights. The deposition potentials and deposition times allow further control of the mesoporous structure and its thickness, respectively. Procedures for example applications are included: glucose oxidation, ethanol oxidation and methanol oxidation reactions. The synthetic methods for preparation of mesoporous metal films will take ~4 h; the subsequent electrochemical tests will take ~5 h for glucose sensing and ~3 h for alcohol oxidation reaction.
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13
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Hu H, Wang B, Li Y, Wang P, Yang L. Acetylcholinesterase Sensor with Patterned Structure for Detecting Organophosphorus Pesticides Based on Titanium Dioxide Sol‐gel Carrier. ELECTROANAL 2020. [DOI: 10.1002/elan.202060027] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Huaying Hu
- Key Laboratory of Advanced Display and System Applications, Ministry of EducationShanghai University Yanchang Road 149 Shanghai 200072 China
| | - Bo Wang
- Key Laboratory of Advanced Display and System Applications, Ministry of EducationShanghai University Yanchang Road 149 Shanghai 200072 China
| | - Yiru Li
- Key Laboratory of Advanced Display and System Applications, Ministry of EducationShanghai University Yanchang Road 149 Shanghai 200072 China
| | - Pengchang Wang
- Key Laboratory of Advanced Display and System Applications, Ministry of EducationShanghai University Yanchang Road 149 Shanghai 200072 China
| | - Lianqiao Yang
- Key Laboratory of Advanced Display and System Applications, Ministry of EducationShanghai University Yanchang Road 149 Shanghai 200072 China
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14
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Nagaura T, Park T, Lim H, Lin J, Iqbal M, Alshehri SM, Ahamad T, Kaneti YV, Yi JW, Kim Y, Na J, Yamauchi Y. Controlled Synthesis of Mesoporous Pt, Pt-Pd and Pt-Pd-Rh Nanoparticles in Aqueous Nonionic Surfactant Solution. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2020. [DOI: 10.1246/bcsj.20190316] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Affiliation(s)
- Tomota Nagaura
- School of Chemical Engineering and Australian Institute for Bioengineering and Nanotechnology (AIBN), The University of Queensland, Brisbane, QLD 4072, Australia
| | - Teahoon Park
- Carbon Composite Department, Composites Research Division, Korea Institute of Materials Science (KIMS), 797, Changwon-daero, Seongsan-gu, Changwon-si, Gyeongsangnam-do, 51508, South Korea
| | - Hyunsoo Lim
- School of Chemical Engineering and Australian Institute for Bioengineering and Nanotechnology (AIBN), The University of Queensland, Brisbane, QLD 4072, Australia
| | - Jianjian Lin
- Key Laboratory of Eco-chemical Engineering, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, P. R. China
| | - Muhammad Iqbal
- International Research Center for Materials Nanoarchitechtonics (WPI-MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
| | - Saad M. Alshehri
- Department of Chemistry, College of Science, King Saud University, Riyadh, 11451, Saudi Arabia
| | - Tansir Ahamad
- Department of Chemistry, College of Science, King Saud University, Riyadh, 11451, Saudi Arabia
| | - Yusuf Valentino Kaneti
- International Research Center for Materials Nanoarchitechtonics (WPI-MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
| | - Jin Woo Yi
- Carbon Composite Department, Composites Research Division, Korea Institute of Materials Science (KIMS), 797, Changwon-daero, Seongsan-gu, Changwon-si, Gyeongsangnam-do, 51508, South Korea
| | - Yena Kim
- Key Laboratory of Eco-chemical Engineering, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, P. R. China
- International Research Center for Materials Nanoarchitechtonics (WPI-MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
| | - Jongbeom Na
- School of Chemical Engineering and Australian Institute for Bioengineering and Nanotechnology (AIBN), The University of Queensland, Brisbane, QLD 4072, Australia
- Key Laboratory of Eco-chemical Engineering, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, P. R. China
- International Research Center for Materials Nanoarchitechtonics (WPI-MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
| | - Yusuke Yamauchi
- School of Chemical Engineering and Australian Institute for Bioengineering and Nanotechnology (AIBN), The University of Queensland, Brisbane, QLD 4072, Australia
- Department of Plant & Environmental New Resources, Kyung Hee University, 1732 Deogyeong-daero, Giheung-gu, Yongin-si, Gyeonggi-do 446-701, South Korea
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15
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Fan C, Liu J, Zhao H, Li L, Liu M, Gao J, Ma L. Molecular imprinting on PtPd nanoflowers for selective recognition and determination of hydrogen peroxide and glucose. RSC Adv 2019; 9:33678-33683. [PMID: 35528877 PMCID: PMC9073546 DOI: 10.1039/c9ra05677g] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2019] [Accepted: 10/02/2019] [Indexed: 12/26/2022] Open
Abstract
PtPd nanoflowers (PtPd NFs) exhibit intrinsic peroxidase-like activity as nanozymes, but the nanozymes lack substrate specificity and have low catalytic activity. Herein, a molecularly imprinted nanogel on PtPd NFs was prepared by using 3,3',5,5'-tetramethylbenzidine (TMB) as the template through the aqueous precipitation polymerization method. After the TMB was washed out, many substrate binding pockets were retained in the PtPd NFs. Scanning electron microscopy (SEM), transmission electron microscopy (TEM) and powder X-ray diffraction (XRD) were employed to characterize the molecularly imprinted polymer (MIP) PtPd nanoflowers (T-MIP-PtPd NFs). The obtained T-MIP-PtPd NFs exhibited enhanced catalytic activity and specific recognition for TMB. Compared with PtPd NFs, T-MIP-PtPd NFs showed a linear range from 0.01-5000 μM and a detection limit of 0.005 μM toward the detection of H2O2. Glucose can also be sensitively detected through cascade reaction by the T-MIP-PtPd NFs and glucose oxidase. Therefore, molecular imprinting on nanozymes technology shows promising application in biocatalysis and sensing fields.
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Affiliation(s)
- Caini Fan
- Department of Hypertension, Henan Provincial People's Hospital Zheng Zhou 450003 China
| | - Junjia Liu
- School of Chemical Engineering and Technology, Hebei University of Technology Tianjin 300130 China
| | - Haiying Zhao
- Department of Hypertension, Henan Provincial People's Hospital Zheng Zhou 450003 China
| | - Ling Li
- Department of Hypertension, Henan Provincial People's Hospital Zheng Zhou 450003 China
| | - Min Liu
- Department of Hypertension, Henan Provincial People's Hospital Zheng Zhou 450003 China
| | - Jing Gao
- School of Chemical Engineering and Technology, Hebei University of Technology Tianjin 300130 China
| | - Li Ma
- School of Chemical Engineering and Technology, Hebei University of Technology Tianjin 300130 China
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An acetylcholinesterase biosensor based on doping Au nanorod@SiO2 nanoparticles into TiO2-chitosan hydrogel for detection of organophosphate pesticides. Biosens Bioelectron 2019; 141:111452. [DOI: 10.1016/j.bios.2019.111452] [Citation(s) in RCA: 55] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2019] [Revised: 06/18/2019] [Accepted: 06/19/2019] [Indexed: 11/23/2022]
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17
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Influence of Mono- and Bimetallic PtO x, PdO x, PtPdO x Clusters on CO Sensing by SnO₂ Based Gas Sensors. NANOMATERIALS 2018; 8:nano8110917. [PMID: 30405032 PMCID: PMC6266303 DOI: 10.3390/nano8110917] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/17/2018] [Revised: 10/31/2018] [Accepted: 11/03/2018] [Indexed: 11/17/2022]
Abstract
To obtain a nanocrystalline SnO₂ matrix and mono- and bimetallic nanocomposites SnO₂/Pd, SnO₂/Pt, and SnO₂/PtPd, a flame spray pyrolysis with subsequent impregnation was used. The materials were characterized using X-ray diffraction (XRD), a single-point BET method, transmission electron microscopy (TEM), and high angle annular dark field scanning transmission electron microscopy (HAADF-STEM) with energy dispersive X-ray (EDX) mapping. The electronic state of the metals in mono- and bimetallic clusters was determined using X-ray photoelectron spectroscopy (XPS). The active surface sites were investigated using the Fourier Transform infrared spectroscopy (FTIR) and thermo-programmed reduction with hydrogen (TPR-H₂) methods. The sensor response of blank SnO₂ and nanocomposites had a carbon monoxide (CO) level of 6.7 ppm and was determined in the temperature range 60⁻300 °C in dry (Relative Humidity (RH) = 0%) and humid (RH = 20%) air. The sensor properties of the mono- and bimetallic nanocomposites were analyzed on the basis of information on the electronic state, the distribution of modifiers in SnO₂ matrix, and active surface centers. For SnO₂/PtPd, the combined effect of the modifiers on the electrophysical properties of SnO₂ explained the inversion of sensor response from n- to p-types observed in dry conditions.
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