Defect-Mediated Charge Carrier Recombination of Zinc-Silver-Indium Sulfide QDs in the Presence of Naphthoquinone Derivatives: An Insight into the Interfacial Surface Dynamics

Naupada Preeyanka; Tanmay Goswami; Ramchandra Saha; Amit Akhuli; Asish K. Dehury; Moloy Sarkar

doi:10.1021/acs.jpcc.2c05369

Defect-Mediated Charge Carrier Recombination of Zinc-Silver-Indium Sulfide QDs in the Presence of Naphthoquinone Derivatives: An Insight into the Interfacial Surface Dynamics

Naupada Preeyanka, Tanmay Goswami, Ramchandra Saha, Amit Akhuli, Asish K. Dehury, Moloy Sarkar^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

1 Citation (Scopus)

Abstract

Although quantum dots (QDs) are perceived to be similar to fluorescent organic dyes, the underlying mechanism behind their photophysical response in the presence of analytes may not necessarily follow the path usually taken by molecular dyes. With the aim to understand how the exciton dynamics of QDs proceeds in the presence of chemical analytes, a thorough spectroscopic investigation of less-toxic zinc-silver-indium sulfide (ZAIS) QDs in the presence of selected naphthoquinone derivatives (analytes) has been undertaken in an aqueous medium. Specifically, the charge carrier recombination dynamics of ZAIS has been probed in the presence of chosen analytes by systematically varying the chemical functionalities attached to these analytes. The absorbance, fluorescence, and transient absorption measurements infer that fluorescence quenching of ZAIS in the presence of analytes proceeds through a very different pathway from that usually observed for molecular dye analyte systems. This observation has been rationalized by considering the presence of active surface of QDs and subsequent changes in their surface dynamics in the presence of analytes.

Original language	English
Pages (from-to)	15838-15848
Number of pages	11
Journal	Journal of Physical Chemistry C
Volume	126
Issue number	37
DOIs	https://doi.org/10.1021/acs.jpcc.2c05369
Publication status	Published - 13 Sept 2022
Externally published	Yes

Funding

N.P. acknowledges NISER for fellowship and infrastructure. The authors thank the Centre for Interdisciplinary Sciences (CIS) , NISER, for TEM facility . T.G. thanks CSIR (09/1129 (0009) /2017-EMR-I) , India, for providing fellowship during the research tenure. R.S. would like to thank CSIR (09/1129 (12884) /2021-EMR-I) , India, for providing fellowship during his research tenure. A. A . thanks the Department of Science and Technology (DST) for providing fellowship (reference no. DST/INSPIRE Fellowship/2018/IF180141) . The authors gratefully acknowledge Prof . Hirendra Nath Ghosh from the Institute of Nano Science and Technology (INST) , Mohali, India, for helping us in carrying out transient absorption measurements by using the facility from INST, Mohali, India.

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
General Energy
Physical and Theoretical Chemistry
Surfaces, Coatings and Films

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title = "Defect-Mediated Charge Carrier Recombination of Zinc-Silver-Indium Sulfide QDs in the Presence of Naphthoquinone Derivatives: An Insight into the Interfacial Surface Dynamics",

abstract = "Although quantum dots (QDs) are perceived to be similar to fluorescent organic dyes, the underlying mechanism behind their photophysical response in the presence of analytes may not necessarily follow the path usually taken by molecular dyes. With the aim to understand how the exciton dynamics of QDs proceeds in the presence of chemical analytes, a thorough spectroscopic investigation of less-toxic zinc-silver-indium sulfide (ZAIS) QDs in the presence of selected naphthoquinone derivatives (analytes) has been undertaken in an aqueous medium. Specifically, the charge carrier recombination dynamics of ZAIS has been probed in the presence of chosen analytes by systematically varying the chemical functionalities attached to these analytes. The absorbance, fluorescence, and transient absorption measurements infer that fluorescence quenching of ZAIS in the presence of analytes proceeds through a very different pathway from that usually observed for molecular dye analyte systems. This observation has been rationalized by considering the presence of active surface of QDs and subsequent changes in their surface dynamics in the presence of analytes.",

author = "Naupada Preeyanka and Tanmay Goswami and Ramchandra Saha and Amit Akhuli and Dehury, {Asish K.} and Moloy Sarkar",

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doi = "10.1021/acs.jpcc.2c05369",

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journal = "Journal of Physical Chemistry C",

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Defect-Mediated Charge Carrier Recombination of Zinc-Silver-Indium Sulfide QDs in the Presence of Naphthoquinone Derivatives: An Insight into the Interfacial Surface Dynamics. / Preeyanka, Naupada; Goswami, Tanmay; Saha, Ramchandra et al.
In: Journal of Physical Chemistry C, Vol. 126, No. 37, 13.09.2022, p. 15838-15848.

Research output: Contribution to journal › Article › peer-review

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AU - Dehury, Asish K.

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AB - Although quantum dots (QDs) are perceived to be similar to fluorescent organic dyes, the underlying mechanism behind their photophysical response in the presence of analytes may not necessarily follow the path usually taken by molecular dyes. With the aim to understand how the exciton dynamics of QDs proceeds in the presence of chemical analytes, a thorough spectroscopic investigation of less-toxic zinc-silver-indium sulfide (ZAIS) QDs in the presence of selected naphthoquinone derivatives (analytes) has been undertaken in an aqueous medium. Specifically, the charge carrier recombination dynamics of ZAIS has been probed in the presence of chosen analytes by systematically varying the chemical functionalities attached to these analytes. The absorbance, fluorescence, and transient absorption measurements infer that fluorescence quenching of ZAIS in the presence of analytes proceeds through a very different pathway from that usually observed for molecular dye analyte systems. This observation has been rationalized by considering the presence of active surface of QDs and subsequent changes in their surface dynamics in the presence of analytes.

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Defect-Mediated Charge Carrier Recombination of Zinc-Silver-Indium Sulfide QDs in the Presence of Naphthoquinone Derivatives: An Insight into the Interfacial Surface Dynamics

Abstract

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