1
|
Wang L, Zhang B, Yang G, Li W, Wang J, Zhang X, Liang G. Spectral analysis on the acceptor concentration-dependent fluorescence resonance energy transfer process in CuInS 2@ZnS-SQ complexes. OPTICS EXPRESS 2022; 30:23695-23703. [PMID: 36225044 DOI: 10.1364/oe.460333] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/04/2022] [Accepted: 06/03/2022] [Indexed: 06/16/2023]
Abstract
Owing to the broad spectral response and flexible choices of donors and acceptors, fluorescence resonance energy transfer (FRET) system based on quantum dots (QDs) is a potential candidate for enhancing performance of solar cells and other optoelectronic devices. Thus it is necessary to develop such FRET systems with high efficiency and understand the involved photophysical dynamics. Here, with type I CuInS2@ZnS core-shell quantum dots as the energy donor, series of CuInS2@ZnS-SQ complexes are synthesized by adjusting the acceptor (squaric acid, SQ) concentration. The FRET dynamics of the samples is systematically investigated by virtue of steady-state emission, time-resolved fluorescence decay, and transient absorption measurements. The experimental results display a positive correlation between the energy transfer efficient (η). The best energy transfer efficient achieved from experimental data is 52%. This work provides better understanding of the photophysical dynamics in similar complexes and facilitates further development of new photoelectronic devices based on relevant FRET systems.
Collapse
|
2
|
Huang B, Liu XP, Chen JS, Mao CJ, Niu HL, Jin BK. Electrochemiluminescence immunoassay for the prostate-specific antigen by using a CdS/chitosan/g-C3N4 nanocomposite. Mikrochim Acta 2020; 187:155. [DOI: 10.1007/s00604-020-4125-y] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2019] [Accepted: 01/17/2020] [Indexed: 02/06/2023]
|
3
|
Maity P, Ghorai N, Dana J, Ghosh HN. Impact of one step alloying on the carrier relaxation and charge separation dynamics of CdxZn1-xSe graded nanocrystals. J Photochem Photobiol A Chem 2020. [DOI: 10.1016/j.jphotochem.2019.112131] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
4
|
Maity P, Ghosh HN. Strategies for extending charge separation in colloidal nanostructured quantum dot materials. Phys Chem Chem Phys 2019; 21:23283-23300. [PMID: 31621729 DOI: 10.1039/c9cp03551f] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Semiconductor colloidal metal chalcogenides (II-VI) in the form of quantum dots (QDs) and different heterostructures (core/shell, alloys, etc.) are of extensive interest in scientific research for both a fundamental understanding and technological applications because of their quantized size and different optical properties; however, due to their small size, the exciton (bound electron and hole) experiences a strong Coulombic attraction, which has a remarkable impact on the charge separation and photophysical properties of QDs. Thus, to achieve an efficient charge separation, numerous attempts have been made via the formation of different heterostructures, QD/molecular adsorbate (either organic or inorganic) assemblies, etc. These hybrid materials ameliorated the absorption of the incident light as well as charge separation. This article reviews the strategies for extending charge separation in these colloidal nanocrystals (NCs), which is one of the crucial steps to elevate the solar to electrical energy conversion efficiency in a quantum dot-sensitized solar cell (QDSC). The article summarizes the benefits of co-sensitization and experimental shreds of evidence for the multiple charge transfer processes involved in a QDSC. Studies have shown that in the co-sensitization process, prolonged charge separation occurs via the dual behavior of the molecular adsorbate, sensitization (electron injection) and capture of holes from photoexcited QDs. This perspective emphases band edge engineering and control of charge carrier dynamics in various core/shell structures. The impact of colloidal alloy NCs on charge separation and interesting photophysical properties was recapitulated via the steady-state and time-resolved photoluminescence (PL) and femtosecond transient absorption spectroscopic techniques. Finally, the prolonged lifetime and extent of charge separation for these hybrid NCs (or the composites) assisted in the development of a better light harvester as compared to the case of their pure counterparts.
Collapse
Affiliation(s)
- Partha Maity
- Radiation and Photochemistry Division, Bhabha Atomic Research Centre, Homi Bhabha National Institute, Mumbai-400085, India.
| | | |
Collapse
|
5
|
Debnath T, Ghosh HN. Ternary Metal Chalcogenides: Into the Exciton and Biexciton Dynamics. J Phys Chem Lett 2019; 10:6227-6238. [PMID: 31556303 DOI: 10.1021/acs.jpclett.9b01596] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Intra-band-gap state-induced low-toxicity colloidal I-III-VI ternary metal chalcogenide nanocrystals (NCs) have emerged as promising alternatives to the toxic Cd- and Pb-chalcogenides for different optoelectronic and bioimaging applications. In this Perspective, we provide the primary understanding of the intra-band-gap state-induced photoluminescence (PL) of I-III-VI NCs, specifically CuInS2 and AgInS2, as a function of particle size and composition and correlated with time-resolved PL measurements. The intra-band-gap state-induced ultrafast exciton and biexciton dynamics are discussed in detail to unravel the subpicosecond carrier relaxation dynamics through transient absorption measurement. Furthermore, ultrafast dissociation of the biexciton on Au@CuInS2 hybrid NCs has been revealed to be due to the presence of Au, which has direct relevance to the improvement of the solar cell efficiency. The proper fundamental insight of the ultrafast exciton and biexciton dynamics of these materials will enable utilization of ternary metal chalcogenides in photovoltaic as well as light-emitting devices.
Collapse
Affiliation(s)
- Tushar Debnath
- Radiation and Photochemistry Division , Bhabha Atomic Research Centre , Mumbai 400085 , India
| | - Hirendra N Ghosh
- Radiation and Photochemistry Division , Bhabha Atomic Research Centre , Mumbai 400085 , India
- Institute of Nano Science and Technology , Mohali , Punjab 160064 , India
| |
Collapse
|
6
|
Simi NJ, Vinayakan R, Ison VV. Photoinduced electron transfer in novel CdSe-Cu 2Se type II core-shell quantum dots. RSC Adv 2019; 9:15092-15098. [PMID: 35516312 PMCID: PMC9064209 DOI: 10.1039/c9ra02027f] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2019] [Accepted: 05/08/2019] [Indexed: 01/11/2023] Open
Abstract
Herein we report the synthesis, characterisation and electron transfer studies of CdSe–Cu2Se QDs, a novel type II core–shell system. The synthesis was achieved by a high temperature organometallic method with oleylamine as ligand. Structural and optical properties of the nanostructures were investigated using X-ray diffraction, high resolution transmission electron microscopy, selected area electron diffraction, energy dispersive X-ray spectroscopy, inductive coupled plasma optical emission spectroscopy, cyclic voltammetry, X-ray photoelectron spectroscopy and absorption spectroscopy. The electron transfer dynamics were investigated by observing the variations in steady state and time resolved emission spectra in the presence of an electron acceptor-methyl viologen. Localization of electrons in the shells was evident from the studies performed indicating efficient charge separation. Herein we report the synthesis, characterisation and electron transfer studies of CdSe–Cu2Se QDs, a novel type II core–shell system.![]()
Collapse
Affiliation(s)
- N J Simi
- Centre for Nano Bio Polymer Science and Technology, Department of Physics, St. Thomas College Palai, Arunapuram Kottayam-686574 Kerala India +919446126926
| | - R Vinayakan
- NSS Hindu College Changanacherry Kottayam-686102 Kerala India
| | - V V Ison
- Centre for Nano Bio Polymer Science and Technology, Department of Physics, St. Thomas College Palai, Arunapuram Kottayam-686574 Kerala India +919446126926
| |
Collapse
|
7
|
Maity P, Gayathri T, Singh SP, Ghosh HN. Impact of FRET between Molecular Aggregates and Quantum Dots. Chem Asian J 2019; 14:597-605. [PMID: 30600921 DOI: 10.1002/asia.201801688] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2018] [Revised: 12/27/2018] [Indexed: 11/10/2022]
Abstract
Energy transfer has been employed in third-generation solar cells for the conversion of light into electrical energy. Long-range nonradiative energy transfer from semiconductor quantum dots (QDs) to fluorophores has been demonstrated by using CdS QDs and thiophene-BODIPY (boron dipyrromethene, abbreviated as TG2). TG2 shows a broad photoluminescence (PL) spectrum, which varies with concentration. At very low concentrations, monomeric units are present; then, upon increasing the concentration, these monomers form a mixed (J-/H-)aggregated state. Energy transfer between the CdS QDs and TG2 was confirmed by separately investigating the interactions between CdS and the monomer of TG2 and between CdS and the aggregated states of TG2. Size-dependent PL quenching confirmed that nonradiative Förster resonance energy transfer (FRET) from photoexcited CdS QDs to the J-aggregate state of TG2 was the major energy-relaxation channel, which occurred on the timescale of hundreds of fs. These results have broad applications in the field of light harvesting based on the assembly of molecular aggregates.
Collapse
Affiliation(s)
- Partha Maity
- Radiation and Photo Chemistry Division, Bhabha Atomic Research Center, Mumbai, 400085, India
| | - Thumuganti Gayathri
- Polymers and Functional Materials Division, CSIR-Indian Institute of Chemical Technology (CSIR-IICT), Tarnaka, Hyderabad, 500007, India
| | - Surya Prakash Singh
- Polymers and Functional Materials Division, CSIR-Indian Institute of Chemical Technology (CSIR-IICT), Tarnaka, Hyderabad, 500007, India
| | - Hirendra N Ghosh
- Radiation and Photo Chemistry Division, Bhabha Atomic Research Center, Mumbai, 400085, India.,Institute of Nano Science & Technology Mohali, Punjab, 160062, India
| |
Collapse
|
8
|
|
9
|
Li PP, Cao Y, Mao CJ, Jin BK, Zhu JJ. TiO2/g-C3N4/CdS Nanocomposite-Based Photoelectrochemical Biosensor for Ultrasensitive Evaluation of T4 Polynucleotide Kinase Activity. Anal Chem 2018; 91:1563-1570. [DOI: 10.1021/acs.analchem.8b04823] [Citation(s) in RCA: 75] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Pan-Pan Li
- Anhui Province Key Laboratory of Chemistry for Inorganic/Organic Hybrid Functionalized Materials, School of Chemistry and Chemical Engineering, Anhui University, Hefei 230601, P. R. China
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, P. R. China
| | - Yue Cao
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, P. R. China
| | - Chang-Jie Mao
- Anhui Province Key Laboratory of Chemistry for Inorganic/Organic Hybrid Functionalized Materials, School of Chemistry and Chemical Engineering, Anhui University, Hefei 230601, P. R. China
| | - Bao-Kang Jin
- Anhui Province Key Laboratory of Chemistry for Inorganic/Organic Hybrid Functionalized Materials, School of Chemistry and Chemical Engineering, Anhui University, Hefei 230601, P. R. China
| | - Jun-Jie Zhu
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, P. R. China
| |
Collapse
|
10
|
Maiti S, Dana J, Ghosh HN. Correlating Charge‐Carrier Dynamics with Efficiency in Quantum‐Dot Solar Cells: Can Excitonics Lead to Highly Efficient Devices? Chemistry 2018; 25:692-702. [DOI: 10.1002/chem.201801853] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2018] [Revised: 07/06/2018] [Indexed: 11/06/2022]
Affiliation(s)
- Sourav Maiti
- Radiation & Photochemistry DivisionBhabha Atomic Research Centre Mumbai 400085 India
- Department of ChemistrySavitribai Phule Pune University Ganeshkhind Pune 411007 India
| | - Jayanta Dana
- Radiation & Photochemistry DivisionBhabha Atomic Research Centre Mumbai 400085 India
| | - Hirendra N. Ghosh
- Radiation & Photochemistry DivisionBhabha Atomic Research Centre Mumbai 400085 India
- Institute of Nano Science and Technology Mohali Punjab 160062 India
| |
Collapse
|
11
|
Charge carrier dynamics in CdTe/ZnTe core/shell nanocrystals for photovoltaic applications
$$^{\S }$$
§. J CHEM SCI 2018. [DOI: 10.1007/s12039-018-1544-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|
12
|
Alsulami QA. Long lived-charge separation of ultrafast bimolecular electron transfer at PCE10 and fullerene interfaces. Chem Phys Lett 2018. [DOI: 10.1016/j.cplett.2018.06.064] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
|
13
|
Maiti S, Azlan F, Anand P, Jadhav Y, Dana J, Haram SK, Ghosh HN. Boosting the Efficiency of Quantum Dot-Sensitized Solar Cells through Formation of the Cation-Exchanged Hole Transporting Layer. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:50-57. [PMID: 29219326 DOI: 10.1021/acs.langmuir.7b02659] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
In search of a viable way to enhance the power conversion efficiency (PCE) of quantum dot-sensitized solar cells, we have designed a method by introducing a hole transporting layer (HTL) of p-type CuS through partial cation exchange process in a postsynthetic ligand-assisted assembly of nanocrystals (NCs). High-quality CdSe and CdSSe gradient alloy NCs were synthesized through colloidal method, and the charge carrier dynamics was monitored through ultrafast transient absorption measurements. A notable increase in the short-circuit current concomitant with the increase in open-circuit voltage and the fill factor led to 45% increment in PCE for CdSe-based solar cells upon formation of the CuS HTL. Electrochemical impedance spectroscopy further revealed that the CuS layer formation increases recombination resistance at the TiO2/NC/electrolyte interface, implying that interfacial recombination gets drastically reduced because of smooth hole transfer to the redox electrolyte. Utilizing the same approach for CdSSe alloy NCs, the highest PCE (4.03%) was obtained upon CuS layer formation compared to 3.26% PCE for the untreated one and 3.61% PCE with the conventional ZnS coating. Therefore, such strategies will help to overcome the kinetic barriers of hole transfer to electrolytes, which is one of the major obstacles of high-performance devices.
Collapse
Affiliation(s)
- Sourav Maiti
- Radiation and Photochemistry Division, Bhabha Atomic Research Centre , Mumbai 400085, India
- Department of Chemistry, Savitribai Phule Pune University , Ganeshkhind, Pune 411007, India
| | - Farazuddin Azlan
- Radiation and Photochemistry Division, Bhabha Atomic Research Centre , Mumbai 400085, India
| | - Pranav Anand
- Radiation and Photochemistry Division, Bhabha Atomic Research Centre , Mumbai 400085, India
| | - Yogesh Jadhav
- Department of Chemistry, Savitribai Phule Pune University , Ganeshkhind, Pune 411007, India
| | - Jayanta Dana
- Radiation and Photochemistry Division, Bhabha Atomic Research Centre , Mumbai 400085, India
- Homi Bhabha National Institute , Mumbai 400094, India
| | - Santosh K Haram
- Department of Chemistry, Savitribai Phule Pune University , Ganeshkhind, Pune 411007, India
| | - Hirendra N Ghosh
- Radiation and Photochemistry Division, Bhabha Atomic Research Centre , Mumbai 400085, India
- Institute of Nano Science and Technology , Mohali, Punjab 160062, India
| |
Collapse
|
14
|
Khan A, Aziz MA, Qamar M. Simple and Enhanced Thermal Immobilization of Gold Nanoparticles on TiO2coated ITO Electrodes for Photoelectrochemical Water Oxidation. ChemistrySelect 2017. [DOI: 10.1002/slct.201701648] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- A. Khan
- Center of Excellence in Nanotechnology (CENT); King Fahd University of Petroleum and Minerals, KFUPM, Box 5040; Dhahran 31261 Saudi Arabia
| | - Md. Abdul Aziz
- Center of Excellence in Nanotechnology (CENT); King Fahd University of Petroleum and Minerals, KFUPM, Box 5040; Dhahran 31261 Saudi Arabia
| | - Mohammad Qamar
- Center of Excellence in Nanotechnology (CENT); King Fahd University of Petroleum and Minerals, KFUPM, Box 5040; Dhahran 31261 Saudi Arabia
| |
Collapse
|
15
|
Singhal P, Maity P, Jha SK, Ghosh HN. Metal-Ligand Complex-Induced Ultrafast Charge-Carrier Relaxation and Charge-Transfer Dynamics in CdX (X=S, Se, Te) Quantum Dots Sensitized with Nitrocatechol. Chemistry 2017; 23:10590-10596. [PMID: 28556260 DOI: 10.1002/chem.201701271] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2017] [Indexed: 11/10/2022]
Abstract
The present work describes the effect of interfacial complex formation on charge carrier dynamics in CdX (X=S, Se, Te) quantum dots (QDs) sensitized nitro catechol (NCAT). To compare experiments were also carried out with catechol (CAT) where no such complexation was observed. Time-resolved emission studies suggest faster charge separation in CdS(Se)/NCAT system as compared to CdS(Se)/CAT although change in Gibbs free energy for hole transfer is less in former as compared to later. This suggests that complex formation favours charge separation. Similar studies were also carried out in CdTe/NCAT system where hole transfer process was not viable thermodynamically but due to complex formation charge separation was observed. Femtosecond transient absorption studies have been carried out to monitor charge carrier dynamics in early time scale. Transient studies show faster electron cooling in QDs/NCAT system as compared to pure QDs and has been assigned to the complex formation on QDs surface. Interestingly charge recombination dynamics is much faster in QDs/NCAT system as compared to pure QDs which can be attributed to the stronger coupling between QDs and NCAT. Our results suggest a strong metal-ligand complex formation on QDs surface that controls charge carrier dynamics in QDs/molecular adsorbate system and to the best of our knowledge it has never been reported.
Collapse
Affiliation(s)
- Pallavi Singhal
- Homi Bhabha National Institute, Mumbai, 400 085, India.,Health Physics Division, Bhabha Atomic Research Centre, Mumbai, 400 085, India
| | - Partha Maity
- Radiation and Photochemistry Division, Bhabha Atomic Research Centre, Mumbai, 400 085, India
| | - Sanjay K Jha
- Homi Bhabha National Institute, Mumbai, 400 085, India.,Health Physics Division, Bhabha Atomic Research Centre, Mumbai, 400 085, India
| | - Hirendra N Ghosh
- Radiation and Photochemistry Division, Bhabha Atomic Research Centre, Mumbai, 400 085, India.,Institute of Nano Science and Technology, Habitat Centre, Mohali, Punjab, 160062, India
| |
Collapse
|
16
|
Debnath T, Sebastian D, Maiti S, Ghosh HN. Tuning Hole and Electron Transfer from Photoexcited CdSe Quantum Dots to Phenol Derivatives: Effect of Electron-Donating and -Withdrawing Moieties. Chemistry 2017; 23:7306-7314. [PMID: 28345273 DOI: 10.1002/chem.201700166] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2017] [Indexed: 11/09/2022]
Abstract
Charge-transfer processes from photoexcited CdSe quantum dots (QDs) to phenol derivatives with electron- donating (4-methoxy) and -withdrawing (4-nitro) moieties have been demonstrated by using steady-state and time- resolved emission and femtosecond transient absorption spectroscopy. Steady-state and time-resolved emission studies suggest that in the presence of both 4-nitrophenol (4NP) and 4-methoxyphenol (4MP) CdSe QDs luminescence is quenched. Stern-Volmer analysis suggests both static and dynamic mechanisms are active for both the QD/phenol composites. Cyclic voltammetric analysis recommends that photoexcited CdSe QDs can donate electrons to 4NP and holes to 4MP. To reconfirm both electron- and hole-transfer mechanisms, CdSe/CdS quasi-type II and CdSe/CdTe type II core-shell nanocrystals were synthesized and photoluminescence quenching was monitored in the absence and presence of both 4NP and 4MP, for which hole and electron transfer were systematically restricted. Results suggest that indeed electron and hole transfer take place from photoexcited CdSe to 4NP and 4MP, respectively. To monitor the charge-transfer dynamics in both systems on an early timescale, femtosecond transient absorption spectroscopic techniques have been employed. Electron and hole transfer and charge-recombination dynamics are discussed and the effect of electron-donating and -withdrawing groups has been demonstrated.
Collapse
Affiliation(s)
- Tushar Debnath
- Radiation and Photochemistry Division, Bhabha Atomic Research Centre, Mumbai, 400 085, India
| | - Deepa Sebastian
- Radiation and Photochemistry Division, Bhabha Atomic Research Centre, Mumbai, 400 085, India
| | - Sourav Maiti
- Radiation and Photochemistry Division, Bhabha Atomic Research Centre, Mumbai, 400 085, India.,Department of Chemistry, Savitribai Phule Pune University, Pune, 411007, India
| | - Hirendra N Ghosh
- Radiation and Photochemistry Division, Bhabha Atomic Research Centre, Mumbai, 400 085, India.,Institute of Nano Science and Technology, Mohali, Punjab, 160062, India
| |
Collapse
|
17
|
Ghosh A, Jana B, Maiti S, Bera R, Ghosh HN, Patra A. Light Harvesting and Photocurrent Generation in a Conjugated Polymer Nanoparticle-Reduced Graphene Oxide Composite. Chemphyschem 2017; 18:1308-1316. [DOI: 10.1002/cphc.201700174] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2017] [Indexed: 12/12/2022]
Affiliation(s)
- Arnab Ghosh
- Department of Materials Science; Indian Association for the Cultivation of Science, Jadavpur; Kolkata 700032 India
| | - Bikash Jana
- Department of Materials Science; Indian Association for the Cultivation of Science, Jadavpur; Kolkata 700032 India
| | - Sourav Maiti
- Radiation and Photochemistry Division; Bhabha Atomic Research Centre; Mumbai 400085 India
- Department of Chemistry; Savitribai Phule Pune University, Ganeshkhind; Pune 411007 India
| | - Rajesh Bera
- Department of Materials Science; Indian Association for the Cultivation of Science, Jadavpur; Kolkata 700032 India
| | - Hirendra N. Ghosh
- Radiation and Photochemistry Division; Bhabha Atomic Research Centre; Mumbai 400085 India
- Institute of Nano Science and Technology; Mohal 160062, Punjab India
| | - Amitava Patra
- Department of Materials Science; Indian Association for the Cultivation of Science, Jadavpur; Kolkata 700032 India
| |
Collapse
|
18
|
Debnath T, Parui K, Maiti S, Ghosh HN. An Insight into the Interface through Excited-State Carrier Dynamics for Promising Enhancement of Power Conversion Efficiency in a Mn-Doped CdZnSSe Gradient Alloy. Chemistry 2017; 23:3755-3763. [DOI: 10.1002/chem.201605612] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2016] [Indexed: 11/07/2022]
Affiliation(s)
- Tushar Debnath
- Radiation & Photochemistry Division; Bhabha Atomic Research Centre; Mumbai 400 085 India), Fax
| | - Kausturi Parui
- Radiation & Photochemistry Division; Bhabha Atomic Research Centre; Mumbai 400 085 India), Fax
| | - Sourav Maiti
- Radiation & Photochemistry Division; Bhabha Atomic Research Centre; Mumbai 400 085 India), Fax
- Department of Chemistry; Savitribai Phule Pune University; Pune 411007 India
| | - Hirendra N. Ghosh
- Radiation & Photochemistry Division; Bhabha Atomic Research Centre; Mumbai 400 085 India), Fax
- Institute of Nano Science and Technology; Mohali Punjab 16062 India
| |
Collapse
|
19
|
Aute S, Maity P, Das A, Ghosh HN. Demonstrating the role of anchoring functionality in interfacial electron transfer dynamics in the newly synthesized BODIPY–TiO2 nanostructure composite. NEW J CHEM 2017. [DOI: 10.1039/c7nj00668c] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Scheme illustrating the extent of coupling and charge recombination dynamics between BODIPY and NS-TiO2 anchoring through the catechol and resorcinol binding group.
Collapse
Affiliation(s)
- Sunil Aute
- Organic Chemistry Division CSIR-National Chemical Laboratory Pune
- Maharashtra
- India
| | - Partha Maity
- Radiation & Photochemistry Division
- Bhabha Atomic Research Centre
- Mumbai-400085
- India
| | - Amitava Das
- Organic Chemistry Division CSIR-National Chemical Laboratory Pune
- Maharashtra
- India
- CSIR-Central Salt & Marine Chemicals Research Institute
- Bhavnagar-364002
| | - Hirendra N. Ghosh
- Radiation & Photochemistry Division
- Bhabha Atomic Research Centre
- Mumbai-400085
- India
- Institute of Nano Science & Technology
| |
Collapse
|
20
|
|
21
|
Chauhan H, Kumar Y, Dana J, Satpati B, Ghosh HN, Deka S. Photoinduced ultrafast charge separation in colloidal 2-dimensional CdSe/CdS-Au hybrid nanoplatelets and corresponding application in photocatalysis. NANOSCALE 2016; 8:15802-12. [PMID: 27533050 DOI: 10.1039/c6nr03610d] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
Multicomponent hybrid nanocrystals (HNC) consisting of a semiconductor and metallic domains are an important class of nanostructured materials demonstrating useful applications and interesting basic knowledge. In this scenario, Au nanoparticle (NP) islands of ∼2 nm have been grown on unique two dimensional (2D) CdSe/CdS core@shell hexagonal nanoheteroplatelets of 20 nm diameter to form unprecedented 2D CdSe/CdS-Au HNCs and detailed optical characterization has been carried out to determine the dimensionality based electron transfer dynamics on the ultrafast scale. Steady state optical absorption studies show that upon growing Au NPs onto the 2D nanoplates, a new band appears in the red region of the spectra (500-800 nm), which suggests a strong interaction between the exciton of the core-shell and the plasmon of the metal NPs. Fluorescence studies showed the quenching of emission of the semiconductor domains upon the growth of the metallic domains. Detailed optical and TRPL studies suggested efficient charge transfer from the 2D CdSe/CdS to the Au domains, irrespective of excitation wavelength. Femtosecond transient absorption studies suggest that the electron transfer from the 2D hybrid nanocrystals to the metal domain is on an ultrafast time scale (∼800 fs). No evidence is observed for charge transfer from the 2 nm Au domains to the semiconductor seeds. The broad absorption in the visible region of the hybrid nanocrystals and the ultrafast charge transfer facilitates very efficient photo-catalytic reactions under direct sun light, as a case study.
Collapse
Affiliation(s)
- Himani Chauhan
- Department of Chemistry, University of Delhi, North campus, Delhi-110007, India.
| | - Yogesh Kumar
- Department of Chemistry, University of Delhi, North campus, Delhi-110007, India.
| | - Jayanta Dana
- Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Mumbai - 400085, India.
| | - Biswarup Satpati
- Saha Institute of Nuclear Physics, 1/AF, Bidhannagar, Kolkata 700 064, India
| | - Hirendra N Ghosh
- Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Mumbai - 400085, India.
| | - Sasanka Deka
- Department of Chemistry, University of Delhi, North campus, Delhi-110007, India.
| |
Collapse
|
22
|
Tang Y, Wang R, Yang Y, Yan D, Xiang X. Highly Enhanced Photoelectrochemical Water Oxidation Efficiency Based on Triadic Quantum Dot/Layered Double Hydroxide/BiVO4 Photoanodes. ACS APPLIED MATERIALS & INTERFACES 2016; 8:19446-55. [PMID: 27419597 DOI: 10.1021/acsami.6b04937] [Citation(s) in RCA: 103] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
The water oxidation half-reaction is considered to be a bottleneck for achieving highly efficient solar-driven water splitting due to its multiproton-coupled four-electron process and sluggish kinetics. Herein, a triadic photoanode consisting of dual-sized CdTe quantum dots (QDs), Co-based layered double hydroxide (LDH) nanosheets, and BiVO4 particles, that is, QD@LDH@BiVO4, was designed. Two sets of consecutive Type-II band alignments were constructed to improve photogenerated electron-hole separation in the triadic structure. The efficient charge separation resulted in a 2-fold enhancement of the photocurrent of the QD@LDH@BiVO4 photoanode. A significantly enhanced oxidation efficiency reaching above 90% in the low bias region (i.e., E < 0.8 V vs RHE) could be critical in determining the overall performance of a complete photoelectrochemical cell. The faradaic efficiency for water oxidation was almost 90%. The conduction band energy of QDs is ∼1.0 V more negative than that of LDH, favorable for the electron injection to LDH and enabling a more efficient hole separation. The enhanced photon-to-current conversion efficiency and improved water oxidation efficiency of the triadic structure may result from the non-negligible contribution of hot electrons or holes generated in QDs. Such a band-matching and multidimensional triadic architecture could be a promising strategy for achieving high-efficiency photoanodes by sufficiently utilizing and maximizing the functionalities of QDs.
Collapse
Affiliation(s)
- Yanqun Tang
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology , Beijing 100029, People's Republic of China
- Key Laboratory of Theoretical and Computational Photochemistry, Ministry of Education, College of Chemistry, Beijing Normal University , Beijing 100875, People's Republic of China
| | - Ruirui Wang
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology , Beijing 100029, People's Republic of China
| | - Ye Yang
- Chemistry and Nanoscience Center, National Renewable Energy Laboratory , Golden, Colorado 80401, United States
| | - Dongpeng Yan
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology , Beijing 100029, People's Republic of China
- Key Laboratory of Theoretical and Computational Photochemistry, Ministry of Education, College of Chemistry, Beijing Normal University , Beijing 100875, People's Republic of China
| | - Xu Xiang
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology , Beijing 100029, People's Republic of China
| |
Collapse
|
23
|
Debnath T, Maity P, Dana J, Ghosh HN. Effect of Molecular Coupling on Ultrafast Electron-Transfer and Charge-Recombination Dynamics in a Wide-Gap ZnS Nanoaggregate Sensitized by Triphenyl Methane Dyes. Chemphyschem 2015; 17:724-30. [DOI: 10.1002/cphc.201500883] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2015] [Indexed: 11/12/2022]
Affiliation(s)
- Tushar Debnath
- Radiation & Photochemistry Division; Bhabha Atomic Research Centre, Trombay; Mumbai 400 085 India
| | - Partha Maity
- Radiation & Photochemistry Division; Bhabha Atomic Research Centre, Trombay; Mumbai 400 085 India
| | - Jayanta Dana
- Radiation & Photochemistry Division; Bhabha Atomic Research Centre, Trombay; Mumbai 400 085 India
| | - Hirendra N. Ghosh
- Radiation & Photochemistry Division; Bhabha Atomic Research Centre, Trombay; Mumbai 400 085 India
| |
Collapse
|
24
|
Debnath T, Maiti S, Maity P, Ghosh HN. Subpicosecond Exciton Dynamics and Biexcitonic Feature in Colloidal CuInS2 Nanocrystals: Role of In-Cu Antisite Defects. J Phys Chem Lett 2015; 6:3458-65. [PMID: 26273721 DOI: 10.1021/acs.jpclett.5b01767] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Charge carrier dynamics of multinary quantum dots like CuInS2 (CIS) nanocrystals (NCs) is not clearly understood, especially in ultrafast time scales. Herein we have synthesized colloidal CIS NCs that show defect-induced emission between donor (antisite) and acceptor (internal/surface) states as indicated from steady-state and time-resolved photoluminescence (PL) measurements. Subpicosecond transient absorption (TA) spectra of CIS NCs reveal a gradient of electronic states that exists above the conduction band edge. The electron cooling rate has been determined to be ∼0.1-0.15 eV/ps. The cascade of electron cooling dynamics was monitored after following the TA kinetics at different electronic states. Interestingly, the kinetics at the antisite state unveil a biexcitonic feature, which has been enlightened through a probe-induced biexciton mechanism. With progressively higher fluence (⟨N⟩), the biexciton binding energy increases, and the electron cooling to the antisite state considerably slows down. Extra energy released during Auger recombination of bi/multiexcitons are used to re-excite the electron to a further high energy level, resulting in longer electron cooling time to the antisite states.
Collapse
Affiliation(s)
- Tushar Debnath
- Radiation & Photochemistry Division, Bhabha Atomic Research Centre , Mumbai 400085, India
| | - Sourav Maiti
- Radiation & Photochemistry Division, Bhabha Atomic Research Centre , Mumbai 400085, India
| | - Partha Maity
- Radiation & Photochemistry Division, Bhabha Atomic Research Centre , Mumbai 400085, India
| | - Hirendra N Ghosh
- Radiation & Photochemistry Division, Bhabha Atomic Research Centre , Mumbai 400085, India
| |
Collapse
|
25
|
Pang X, Pan J, Gao P, Wang Y, Wang L, Du B, Wei Q. A visible light induced photoelectrochemical aptsensor constructed by aligned ZnO@CdTe core shell nanocable arrays/carboxylated g-C3N4 for the detection of Proprotein convertase subtilisin/kexin type 6 gene. Biosens Bioelectron 2015; 74:49-58. [PMID: 26119758 DOI: 10.1016/j.bios.2015.06.030] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2015] [Revised: 06/04/2015] [Accepted: 06/15/2015] [Indexed: 11/19/2022]
Abstract
It was reported that Proprotein convertase subtilisin/kexin type 6 (PCSK6) can promote the progression of rheumatoid arthritis to a higher aggressive status. In this work, a novel visible light induced photoelectrochemical (PEC) platform was designed to detect PCSK6 gene. ZnO@CdTe nanocable arrays/carboxylated g-C3N4 used as the PEC signal generator. Hexagonal ZnO nanorods grew on ITO electrode firstly. CdTe were then electrodeposited on the ZnO nanorods surface to enhance the photogenerated h(+)/e(-) separation efficiency. Carboxylated g-C3N4 was utilized to improve h(+)/e(-) separation efficiency and anchor the capture probes of PCSK6 gene by the covalent bonding effect. The 5' and 3' primers captured PCSK6 ssDNA by the specific recognition. The linear range was 10 pg/mL to 20.0 ng/mL with a detection limit of 2 pg/mL.
Collapse
Affiliation(s)
- Xuehui Pang
- Key Laboratory of Chemical Sensing & Analysis in Universities of Shandong, School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, China
| | - Jihong Pan
- Shandong Medicinal Biotechnology Centre, The Key Lab for Biotechnology Drugs of Ministry of Health, The Key Lab of Rare and Uncommon Disease, Jinan 250022, China
| | - Picheng Gao
- Key Laboratory of Chemical Sensing & Analysis in Universities of Shandong, School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, China
| | - Youying Wang
- Key Laboratory of Chemical Sensing & Analysis in Universities of Shandong, School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, China
| | - Liguo Wang
- Key Laboratory of Chemical Sensing & Analysis in Universities of Shandong, School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, China
| | - Bin Du
- Key Laboratory of Chemical Sensing & Analysis in Universities of Shandong, School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, China.
| | - Qin Wei
- Key Laboratory of Chemical Sensing & Analysis in Universities of Shandong, School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, China
| |
Collapse
|