Direct experimental observation of salt induced aspect ratio tunable PFPT silver-nanowire formation: SERS-based ppt level Hg2+ sensing from ground water

M. Bhattacharya; A. R. Mandal; S. Das Chakraborty; Arpan Maiti; Achyut Maity; D. V. Kuznetsov; P. Mondal; D. Senapati

doi:10.1039/c6ra02900k

Direct experimental observation of salt induced aspect ratio tunable PFPT silver-nanowire formation: SERS-based ppt level Hg²⁺ sensing from ground water

M. Bhattacharya, A. R. Mandal, S. Das Chakraborty, Arpan Maiti, Achyut Maity, D. V. Kuznetsov, P. Mondal, D. Senapati

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

4 Scopus citations

Abstract

A plausible explanation based on real-time direct experimental observation has been put forward to explain the formation of common salt (NaF, NaCl, NaBr, and NaI) induced aspect ratio tunable Pentagonal Faceted Pyramidal Tipped (PFPT) silver-nanowires by considering the solubility product of the in situ generated silver halides, binding affinity of the added halides at the {111} facets on the growing front, and the free energy associated with the crystallographic planes (obtained from HRTEM study) as the driving forces. Aspect ratio dependent Raman activity was verified by using 4-mercaptobenzoic acid (4-MBA) as a Raman tag and due to the preferential binding of Hg²⁺ on the pyramidal tip of the silver-nanowire [i.e., {111} facet], as all the {100} facets are blocked by insoluble silver halides, controlled leaching of the nanowires offers the best-possible Raman platform for the ultra sensitive detection of Hg²⁺ contamination (up to 50 ppt) from ground water.

Original language	English
Pages (from-to)	45279-45289
Number of pages	11
Journal	RSC Advances
Volume	6
Issue number	51
DOIs	https://doi.org/10.1039/c6ra02900k
State	Published - 1 Jan 2016
Externally published	Yes

ASJC Scopus subject areas

General Chemistry
General Chemical Engineering

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10.1039/c6ra02900k

Cite this

@article{164f4d52dcef4044ac860d597bdc377c,

title = "Direct experimental observation of salt induced aspect ratio tunable PFPT silver-nanowire formation: SERS-based ppt level Hg2+ sensing from ground water",

abstract = "A plausible explanation based on real-time direct experimental observation has been put forward to explain the formation of common salt (NaF, NaCl, NaBr, and NaI) induced aspect ratio tunable Pentagonal Faceted Pyramidal Tipped (PFPT) silver-nanowires by considering the solubility product of the in situ generated silver halides, binding affinity of the added halides at the {111} facets on the growing front, and the free energy associated with the crystallographic planes (obtained from HRTEM study) as the driving forces. Aspect ratio dependent Raman activity was verified by using 4-mercaptobenzoic acid (4-MBA) as a Raman tag and due to the preferential binding of Hg2+ on the pyramidal tip of the silver-nanowire [i.e., {111} facet], as all the {100} facets are blocked by insoluble silver halides, controlled leaching of the nanowires offers the best-possible Raman platform for the ultra sensitive detection of Hg2+ contamination (up to 50 ppt) from ground water.",

author = "M. Bhattacharya and Mandal, {A. R.} and Chakraborty, {S. Das} and Arpan Maiti and Achyut Maity and Kuznetsov, {D. V.} and P. Mondal and D. Senapati",

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doi = "10.1039/c6ra02900k",

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T2 - SERS-based ppt level Hg2+ sensing from ground water

AU - Bhattacharya, M.

AU - Mandal, A. R.

AU - Chakraborty, S. Das

AU - Maiti, Arpan

AU - Maity, Achyut

AU - Kuznetsov, D. V.

AU - Mondal, P.

AU - Senapati, D.

PY - 2016/1/1

Y1 - 2016/1/1

N2 - A plausible explanation based on real-time direct experimental observation has been put forward to explain the formation of common salt (NaF, NaCl, NaBr, and NaI) induced aspect ratio tunable Pentagonal Faceted Pyramidal Tipped (PFPT) silver-nanowires by considering the solubility product of the in situ generated silver halides, binding affinity of the added halides at the {111} facets on the growing front, and the free energy associated with the crystallographic planes (obtained from HRTEM study) as the driving forces. Aspect ratio dependent Raman activity was verified by using 4-mercaptobenzoic acid (4-MBA) as a Raman tag and due to the preferential binding of Hg2+ on the pyramidal tip of the silver-nanowire [i.e., {111} facet], as all the {100} facets are blocked by insoluble silver halides, controlled leaching of the nanowires offers the best-possible Raman platform for the ultra sensitive detection of Hg2+ contamination (up to 50 ppt) from ground water.

AB - A plausible explanation based on real-time direct experimental observation has been put forward to explain the formation of common salt (NaF, NaCl, NaBr, and NaI) induced aspect ratio tunable Pentagonal Faceted Pyramidal Tipped (PFPT) silver-nanowires by considering the solubility product of the in situ generated silver halides, binding affinity of the added halides at the {111} facets on the growing front, and the free energy associated with the crystallographic planes (obtained from HRTEM study) as the driving forces. Aspect ratio dependent Raman activity was verified by using 4-mercaptobenzoic acid (4-MBA) as a Raman tag and due to the preferential binding of Hg2+ on the pyramidal tip of the silver-nanowire [i.e., {111} facet], as all the {100} facets are blocked by insoluble silver halides, controlled leaching of the nanowires offers the best-possible Raman platform for the ultra sensitive detection of Hg2+ contamination (up to 50 ppt) from ground water.

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