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Nagaraju N, Kushavah D, Kumar S, Ray R, Gambhir D, Ghosh S, Pal SK. Through structural isomerism: positional effect of alkyne functionality on molecular optical properties. Phys Chem Chem Phys 2022; 24:3303-3311. [PMID: 35050277 DOI: 10.1039/d1cp05024a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Literature studies on the effects of alkyne functionality in manipulating the optical properties of donor-π-acceptor-type molecular scaffolds have been scarce compared to those on the alkene functional group. Here, two structurally isomeric donor-acceptor (D-A) dyes were synthesized to study the positional effect of alkyne functionality (triple bond) on their optical, electrochemical and charge generation properties in order to design efficient dyes for possible application in dye sensitized solar cells (DSSCs). These dyes, named CAPC and PACC, contain carbazole and cyanoacrylic acid as the donor and acceptor units, respectively, and the π-conjugation length within the molecules was controlled by the introduction of an alkyne group. The D-π-A design was followed in designing CAPC with the alkyne serving as the π-spacer, while in PACC, alkyne was placed on the donor, which was directly in conjugation with the acceptor. This rendered equal conjugation lengths within the designed dyes. With the help of photophysical characterizations, it was concluded that CAPC featured better characteristics for a DSSC dye than PACC. Our conclusions were further supported by the results of transient absorption spectroscopy, electrochemical analysis, fluorescence lifetime studies and density functional theory.
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Affiliation(s)
- Nakka Nagaraju
- School of Basic Sciences, Advanced Materials Research Center, Indian Institute of Technology Mandi, Kamand, H.P, 175005, India.
| | - Dushyant Kushavah
- School of Basic Sciences, Advanced Materials Research Center, Indian Institute of Technology Mandi, Kamand, H.P, 175005, India.
| | - Sunil Kumar
- School of Basic Sciences, Advanced Materials Research Center, Indian Institute of Technology Mandi, Kamand, H.P, 175005, India.
| | - Rajeev Ray
- School of Basic Sciences, Advanced Materials Research Center, Indian Institute of Technology Mandi, Kamand, H.P, 175005, India.
| | - Diksha Gambhir
- School of Basic Sciences, Advanced Materials Research Center, Indian Institute of Technology Mandi, Kamand, H.P, 175005, India.
| | - Subrata Ghosh
- School of Basic Sciences, Advanced Materials Research Center, Indian Institute of Technology Mandi, Kamand, H.P, 175005, India.
| | - Suman Kalyan Pal
- School of Basic Sciences, Advanced Materials Research Center, Indian Institute of Technology Mandi, Kamand, H.P, 175005, India.
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Yu H, Lyu Q, Chen X, Guo D, He D, Jia X, Han L, Xiao W. Nylon membranes modified by gold nanoparticles as surface-enhanced Raman spectroscopy substrates for several pesticides detection. RSC Adv 2021; 11:24183-24189. [PMID: 35479016 PMCID: PMC9036823 DOI: 10.1039/d1ra03490a] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2021] [Accepted: 06/23/2021] [Indexed: 12/31/2022] Open
Abstract
Surface enhanced Raman spectroscopy (SERS) is an attractive means for trace compound detection because of its high sensitivity, however, the poor reproducibility is a major challenge. Herein, we propose a facile SERS strategy employing the several developed test processes to improve the repeatability of the SERS analysis based on regular nylon membranes as substrates to detect trace compounds. Various methods, including in situ reduction, immersion adsorption, and filtration, were first compared to prepare composite substrates using nylon membranes and gold nanoparticles. The substrates prepared by filtration showed the best test parallelism (RSD = 7.85%). Its limit of detection (LOD) could reach 10-8 g mL-1 with a good linear relationship in the range 10-8 to 10-7 g mL-1. Finally, three pesticide solutions were tested to verify the substrate applicability. A superior LOD of 10-8 g mL-1 was observed for thiram, whereas the LODs of both phorate and benthiocarb could reach 10-6 g mL-1. Overall, modifying nylon membrane substrates with gold nanoparticles improves the repeatability and economic viability of SERS and favors its wider commercial application for detecting trace compounds.
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Affiliation(s)
- Haitao Yu
- College of Engineering, China Agricultural University (East Campus) Box 191 Beijing 100083 China +86 10 62736778 +86 10 62736778
| | - Qian Lyu
- College of Engineering, China Agricultural University (East Campus) Box 191 Beijing 100083 China +86 10 62736778 +86 10 62736778
| | - Xueli Chen
- College of Engineering, China Agricultural University (East Campus) Box 191 Beijing 100083 China +86 10 62736778 +86 10 62736778
- Laboratory of Renewable Resources Engineering, Department of Agricultural and Biological Engineering, Purdue University West Lafayette Indiana 47907 USA
| | - Dongyi Guo
- College of Engineering, China Agricultural University (East Campus) Box 191 Beijing 100083 China +86 10 62736778 +86 10 62736778
| | - Dingping He
- College of Engineering, China Agricultural University (East Campus) Box 191 Beijing 100083 China +86 10 62736778 +86 10 62736778
| | - Xiwen Jia
- College of Engineering, China Agricultural University (East Campus) Box 191 Beijing 100083 China +86 10 62736778 +86 10 62736778
| | - Lujia Han
- College of Engineering, China Agricultural University (East Campus) Box 191 Beijing 100083 China +86 10 62736778 +86 10 62736778
| | - Weihua Xiao
- College of Engineering, China Agricultural University (East Campus) Box 191 Beijing 100083 China +86 10 62736778 +86 10 62736778
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Kumar A, Thakur N, Diwakar, Chandel T. Tuning of electronic energy levels of NH3 passivated ZnO nanoclusters: A first principle study. COMPUT THEOR CHEM 2020. [DOI: 10.1016/j.comptc.2020.112743] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Barcaro G, Monti S, Sementa L, Carravetta V. Modeling Nucleation and Growth of ZnO Nanoparticles in a Low Temperature Plasma by Reactive Dynamics. J Chem Theory Comput 2019; 15:2010-2021. [DOI: 10.1021/acs.jctc.8b01222] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Giovanni Barcaro
- CNR-IPCF, Institute of Chemical and Physical Processes, via G. Moruzzi 1, I-56124 Pisa, Italy
| | - Susanna Monti
- CNR-ICCOM, Institute of Chemistry of Organometallic Compounds, via G. Moruzzi 1, I-56124 Pisa, Italy
| | - Luca Sementa
- CNR-IPCF, Institute of Chemical and Physical Processes, via G. Moruzzi 1, I-56124 Pisa, Italy
| | - Vincenzo Carravetta
- CNR-IPCF, Institute of Chemical and Physical Processes, via G. Moruzzi 1, I-56124 Pisa, Italy
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Habib M, Ghosh NN, Sarkar R, Pramanik A, Sarkar P, Pal S. Controlling the charge transfer and recombination dynamics in hollow ZnO QD based dye sensitized solar cell: An insight from ab initio simulation. Chem Phys Lett 2018. [DOI: 10.1016/j.cplett.2018.08.036] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Kaygili O, Ercan I, Ates T, Keser S, Orek C, Gunduz B, Seckin T, Bulut N, Bañares L. An experimental and theoretical investigation of the structure of synthesized ZnO powder. Chem Phys 2018. [DOI: 10.1016/j.chemphys.2018.08.021] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Habib M, Saha S, Sarkar R, Pramanik A, Sarkar P, Pal S. Computational design of some TTF-substituted acene-based dyes for solar cell application using hollow ZnO quantum dot as acceptor. COMPUT THEOR CHEM 2018. [DOI: 10.1016/j.comptc.2018.05.012] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Kumar P, Kumar S, Ghosh S, Pal SK. Femtosecond insights into direct electron injection in dye anchored ZnO QDs following charge transfer excitation. Phys Chem Chem Phys 2016; 18:20672-81. [PMID: 27412034 DOI: 10.1039/c6cp01721e] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The role of the charge transfer (CT) state in interfacial electron transfer in dye-sensitized semiconductor nanocrystals is still poorly understood. To address this problem, femtosecond transient absorption (TA) spectroscopy is used as a probe to investigate the electron injection across a newly synthesized coumarin dye (8-hydroxy-2-oxo-4-phenyl-2 benzo[h]chromene-3-carbonitrile, coded BC5) and ZnO quantum dots (QDs). Steady state and time-resolved spectroscopic measurements reveal that BC5 dye interacts strongly with ZnO QDs in the ground state forming a CT complex. The BC5-ZnO QD complex absorbs more towards red compared to only the dye and QDs, and emits fluorescence due to radiative recombination of photogenerated charges. The formation of charges following the excitation of the CT complex has been demonstrated by observing the signature of dye radical cations and electrons in the conduction band (CB) of the QDs in the TA spectra. The TA signals of these charges grow sharply as a result of ultrafast direct electron injection into the QD. We have monitored the complete dynamics of photogenerated charges by measuring the TA signals of the charges up to a couple of nanoseconds. The injected electrons that are free or shallowly trapped recombine with a time constant of 625 fs, whereas deeply trapped electrons disappear slowly (526 ps) via radiative recombination. Furthermore, theoretical studies based on ab initio calculations have been carried out to complement the experimental findings.
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Affiliation(s)
- Pushpendra Kumar
- School of Basic Sciences and Advanced Material Research Center, Indian Institute of Technology Mandi, Kamand 175005, H.P., India.
| | - Sunil Kumar
- School of Basic Sciences and Advanced Material Research Center, Indian Institute of Technology Mandi, Kamand 175005, H.P., India.
| | - Subrata Ghosh
- School of Basic Sciences and Advanced Material Research Center, Indian Institute of Technology Mandi, Kamand 175005, H.P., India.
| | - Suman Kalyan Pal
- School of Basic Sciences and Advanced Material Research Center, Indian Institute of Technology Mandi, Kamand 175005, H.P., India.
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