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Ali MA, Shoaee S, Fan S, Burn PL, Gentle IR, Meredith P, Shaw PE. Detection of Explosive Vapors: The Roles of Exciton and Molecular Diffusion in Real-Time Sensing. Chemphyschem 2016; 17:3350-3353. [PMID: 27583839 DOI: 10.1002/cphc.201600767] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2016] [Indexed: 11/09/2022]
Abstract
Time-resolved quartz crystal microbalance with in situ fluorescence measurements are used to monitor the sorption of the nitroaromatic (explosive) vapor, 2,4-dinitrotoluene (DNT) into a porous pentiptycene-containing poly(phenyleneethynylene) sensing film. Correlation of the nitroaromatic mass uptake with fluorescence quenching shows that the analyte diffusion follows the Case-II transport model, a film-swelling-limited process, in which a sharp diffusional front propagates at a constant velocity through the film. At a low vapor pressure of DNT of ≈16 ppb, the analyte concentration in the front is sufficiently high to give an average fluorophore-analyte separation of ≈1.5 nm. Hence, a long exciton diffusion length is not required for real-time sensing in the solid state. Rather the diffusion behavior of the analyte and the strength of the binding interaction between the analyte and the polymer play first-order roles in the fluorescence quenching process.
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Affiliation(s)
- Mohammad A Ali
- Centre for Organic Photonics & Electronics, School of Chemistry and Molecular Biosciences, School of Mathematics and Physics, The University of Queensland, Brisbane, Queensland, 4072, Australia
| | - Safa Shoaee
- Centre for Organic Photonics & Electronics, School of Chemistry and Molecular Biosciences, School of Mathematics and Physics, The University of Queensland, Brisbane, Queensland, 4072, Australia
| | - Shengqiang Fan
- Centre for Organic Photonics & Electronics, School of Chemistry and Molecular Biosciences, School of Mathematics and Physics, The University of Queensland, Brisbane, Queensland, 4072, Australia
| | - Paul L Burn
- Centre for Organic Photonics & Electronics, School of Chemistry and Molecular Biosciences, School of Mathematics and Physics, The University of Queensland, Brisbane, Queensland, 4072, Australia
| | - Ian R Gentle
- Centre for Organic Photonics & Electronics, School of Chemistry and Molecular Biosciences, School of Mathematics and Physics, The University of Queensland, Brisbane, Queensland, 4072, Australia
| | - Paul Meredith
- Centre for Organic Photonics & Electronics, School of Chemistry and Molecular Biosciences, School of Mathematics and Physics, The University of Queensland, Brisbane, Queensland, 4072, Australia
| | - Paul E Shaw
- Centre for Organic Photonics & Electronics, School of Chemistry and Molecular Biosciences, School of Mathematics and Physics, The University of Queensland, Brisbane, Queensland, 4072, Australia
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Zhou C, Wu Z, Guo Y, Li Y, Cao H, Zheng X, Dou X. Ultrasensitive, Real-time and Discriminative Detection of Improvised Explosives by Chemiresistive Thin-film Sensory Array of Mn(2+) Tailored Hierarchical ZnS. Sci Rep 2016; 6:25588. [PMID: 27161193 PMCID: PMC4861922 DOI: 10.1038/srep25588] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2016] [Accepted: 04/18/2016] [Indexed: 11/25/2022] Open
Abstract
A simple method combing Mn2+ doping with a hierarchical structure was developed for the improvement of thin-film sensors and efficient detection of the explosives relevant to improvised explosive devices (IEDs). ZnS hierarchical nanospheres (HNs) were prepared via a solution-based route and their sensing performances were manipulated by Mn2+ doping. The responses of the sensors based on ZnS HNs towards 8 explosives generally increase firstly and then decrease with the increase of the doped Mn2+ concentration, reaching the climate at 5% Mn2+. Furthermore, the sensory array based on ZnS HNs with different doping levels achieved the sensitive and discriminative detection of 6 analytes relevant to IEDs and 2 military explosives in less than 5 s at room temperature. Importantly, the superior sensing performances make ZnS HNs material interesting in the field of chemiresistive sensors, and this simple method could be a very promising strategy to put the sensors based on thin-films of one-dimensional (1D) nanostructures into practical IEDs detection.
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Affiliation(s)
- Chaoyu Zhou
- School of Life Science and Biotechnology, Liaoning Key Lab of Bio-organic Chemistry, Dalian University, Dalian 116622, Liaoning Province, P. R. China.,Laboratory of Environmental Science and Technology, Xinjiang Technical Institute of Physics &Chemistry; Key Laboratory of Functional Materials and Devices for Special Environments, Chinese Academy of Sciences, Urumqi 830011, China
| | - Zhaofeng Wu
- Laboratory of Environmental Science and Technology, Xinjiang Technical Institute of Physics &Chemistry; Key Laboratory of Functional Materials and Devices for Special Environments, Chinese Academy of Sciences, Urumqi 830011, China
| | - Yanan Guo
- Laboratory of Environmental Science and Technology, Xinjiang Technical Institute of Physics &Chemistry; Key Laboratory of Functional Materials and Devices for Special Environments, Chinese Academy of Sciences, Urumqi 830011, China
| | - Yushu Li
- Laboratory of Environmental Science and Technology, Xinjiang Technical Institute of Physics &Chemistry; Key Laboratory of Functional Materials and Devices for Special Environments, Chinese Academy of Sciences, Urumqi 830011, China
| | - Hongyu Cao
- School of Life Science and Biotechnology, Liaoning Key Lab of Bio-organic Chemistry, Dalian University, Dalian 116622, Liaoning Province, P. R. China
| | - Xuefang Zheng
- School of Life Science and Biotechnology, Liaoning Key Lab of Bio-organic Chemistry, Dalian University, Dalian 116622, Liaoning Province, P. R. China
| | - Xincun Dou
- Laboratory of Environmental Science and Technology, Xinjiang Technical Institute of Physics &Chemistry; Key Laboratory of Functional Materials and Devices for Special Environments, Chinese Academy of Sciences, Urumqi 830011, China
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Koley S, Ghosh S. The study of electron transfer reactions in a dendrimeric assembly: proper utilization of dendrimer fluorescence. Phys Chem Chem Phys 2016; 18:24830-24834. [DOI: 10.1039/c6cp05054a] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Sensing applications of dendrimers: trapping of explosive nitroaromatic compounds within the dendrimer-cage followed by efficient quenching of its fluorescence.
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Affiliation(s)
- Somnath Koley
- School of Chemical Sciences
- National Institute of Science Education and Research
- Bhubaneswar 751005
- India
| | - Subhadip Ghosh
- School of Chemical Sciences
- National Institute of Science Education and Research
- Bhubaneswar 751005
- India
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Rachuri Y, Parmar B, Bisht KK, Suresh E. Mixed ligand two dimensional Cd(ii)/Ni(ii) metal organic frameworks containing dicarboxylate and tripodal N-donor ligands: Cd(ii) MOF is an efficient luminescent sensor for detection of picric acid in aqueous media. Dalton Trans 2016; 45:7881-92. [DOI: 10.1039/c6dt00753h] [Citation(s) in RCA: 140] [Impact Index Per Article: 17.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Two water stable MOFs [M(BrIP)(TIB)]n [M = Cd(ii), Ni(ii)] have been prepared. Cd(ii) MOF serves as photoluminescent sensor for detection of TNP in aqueous phase.
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Affiliation(s)
- Yadagiri Rachuri
- Analytical Division and Centralized Instrument Facility
- CSIR-Central Salt and Marine Chemicals Research Institute
- Council of Scientific and Industrial Research
- Bhavnagar – 364 002
- India
| | - Bhavesh Parmar
- Analytical Division and Centralized Instrument Facility
- CSIR-Central Salt and Marine Chemicals Research Institute
- Council of Scientific and Industrial Research
- Bhavnagar – 364 002
- India
| | - Kamal Kumar Bisht
- Analytical Division and Centralized Instrument Facility
- CSIR-Central Salt and Marine Chemicals Research Institute
- Council of Scientific and Industrial Research
- Bhavnagar – 364 002
- India
| | - Eringathodi Suresh
- Analytical Division and Centralized Instrument Facility
- CSIR-Central Salt and Marine Chemicals Research Institute
- Council of Scientific and Industrial Research
- Bhavnagar – 364 002
- India
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Shoaee S, Fan S, Burn PL, Shaw PE. Photophysics of detection of explosive vapours via luminescence quenching of thin films: impact of inter-molecular interactions. Phys Chem Chem Phys 2016; 18:25861-25868. [DOI: 10.1039/c6cp04536g] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Fluorescence-based detection of explosive analytes requires an understanding of the nature of the excited state responsible for the luminescence response of a sensing material.
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Affiliation(s)
- Safa Shoaee
- Centre for Organic Photonics & Electronics
- The University of Queensland
- Brisbane
- Australia
| | - Shengqiang Fan
- Centre for Organic Photonics & Electronics
- The University of Queensland
- Brisbane
- Australia
| | - Paul L. Burn
- Centre for Organic Photonics & Electronics
- The University of Queensland
- Brisbane
- Australia
| | - Paul E. Shaw
- Centre for Organic Photonics & Electronics
- The University of Queensland
- Brisbane
- Australia
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Ali MA, Geng Y, Cavaye H, Burn PL, Gentle IR, Meredith P, Shaw PE. Molecular versus exciton diffusion in fluorescence-based explosive vapour sensors. Chem Commun (Camb) 2015; 51:17406-9. [PMID: 26465590 DOI: 10.1039/c5cc06367a] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The diffusion of p-nitrotoluene vapours into polymer or dendrimer sensing films follows Super Case II dynamics in which the quenching efficiency is strongly correlated to an accelerating analyte front propagating through the neat film rather than being reliant on exciton diffusion.
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Affiliation(s)
- M A Ali
- Centre for Organic Photonics & Electronics, The University of Queensland, Brisbane, Queensland 4072, Australia.
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Nonlinear absorption and excited state dynamics of porphyrin and phthalocyanine in the presence of explosive molecules. Chem Phys Lett 2015. [DOI: 10.1016/j.cplett.2015.10.049] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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