γ-Cyclodextrin capped silver and gold nanoparticles as colorimetric and Raman sensor for detecting traces of pesticide “Chlorpyrifos” in fruits and vegetables

Chadha, Ridhima; Das, Sudip Kumar; Lobo, Jesswin; Meenu, V.O.; Paul, A.C.; Ballal, Anand; Maiti, Namita

doi:10.1016/j.colsurfa.2022.128558

Cited by 23 publications

(17 citation statements)

References 73 publications

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“…By plotting the target peak area at ∼610 nm vs the log of the concentration, the authors obtained the standard curves shown in Figure 31c and determined LODs of 0.73, 6.7, and 0.74 ng/ mL for chlorpyrifos, diazinon, and malathion, respectively. These LODs are lower than the results reported for other sensing platforms based on conventional plasmonic nanostructures for all three pesticides, chlorpyrifos, 197,198 diazinon, 199 and malathion. 200,201 The portable sensing platform described in this study, with its high sensitivity and reliability, might be suitable for on-site applications of multipesticide quantification.…”

Section: Sensing Of Other Analytescontrasting

confidence: 65%

Plasmonic Nanostars: Systematic Review of their Synthesis and Applications

Ngo

Tran

Lee

2022

ACS Appl. Nano Mater.

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The emergence of plasmonic nanostars with their attractive properties and unique versatility has enabled a wide range of advanced technologies critical to human health, safety, energy, and environmental remediation with vast potential for further exploration. In addition to their superior surface-to-volume ratios compared to those of other plasmonic nanostructures, plasmonic nanostars arguably possess the largest numbers of hotspots with intensely amplified electric fields when they are subjected to suitable electromagnetic waves to trigger localized surface plasmon resonance (LSPR). These outstanding characteristics make plasmonic nanostars ideal for many applications that benefit from the plasmonic enhancement effect of LSPR and/or the large surface area. Over the past decade, an increasing number of research endeavors has been reported on the synthesis and application of plasmonic nanostars to advance the state-of-the-art for various existing technologies. These contributions are pertinent to real-time image-guided multifunctional anticancer theranostics, the ultrasensitive on-site detection of the devastating virus SARS-CoV-2, multimodal multiplexed brain imaging, greatly enhanced catalysts for energy and environmental processes, or more efficient and stable solar cells. In addition to the enhancement of important but familiar technologies, plasmonic nanostars have also been employed to push the technological frontiers in multiple fields to enable applications such as maskless write-on lithography, nanosized field electron emitters, coherent random lasers, neural activity modulation, and optically controlled electrical currents. Despite great performance in various fields since their introduction, the nascency of this unique class of plasmonic nanostructures and the rise of unique types of plasmonic nanostars, in addition to the dominance of gold nanostars in recent years, indicate that there are still many opportunities for study, exploration, and development. This Review outlines a comprehensive picture of the current state of plasmonic nanostar research with a focus on their technological and scientific applications. We hope this Review will enlighten future collective endeavors to develop more effective plasmonic nanostars and incorporate them into mainstream technologies so that these stars can truly shine.

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Section: Sensing Of Other Analytescontrasting

confidence: 65%

Plasmonic Nanostars: Systematic Review of their Synthesis and Applications

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Tran

Lee

2022

ACS Appl. Nano Mater.

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“…The absorption spectrum of the bare SCF is shown in Figure 3A . The figure shows the appearance of a broad band with maximum at 419.6 nm, attributed to the bulk-like surface plasmon resonance (BL-SPR) band ( Le Ru and Etchegoin, 2012 ; Dutta Roy et al, 2018 ; Das et al, 2020 ; Chadha et al, 2021b ; Chadha et al, 2022 ). It is known that the BL-SPR band of the metal NPs strongly depends on the shape, size and the extent of aggregation of the particles in addition to the dielectric constant of the medium as well as the surface adsorbed species ( Jana et al, 2016 ).…”

Section: Resultsmentioning

confidence: 99%

“…For the MC-SCFs with 100 and 1,000 nM concentrations of MC, in addition to the red-shifting of the BL-SPR band, lower energy peaks were found to appear with maxima around 618 and 641 nm. These lower energy peaks were attributed to the surface-like surface plasmon resonance (SL-SPR) band ( Le Ru and Etchegoin, 2012 ; Dutta Roy et al, 2018 ; Das et al, 2020 ; Chadha et al, 2021b ; Chadha et al, 2022 ) that arises due to the dipole-dipole interactions of the higher aggregated particles. From the figure, it is observed that increase in MC concentrations resulted in the lowering of energy of the SL-SPR band with increased magnitude and concomitant broadening.…”

Section: Resultsmentioning

confidence: 99%

“…Lately, SERS is being used for studying in-situ surface-catalyzed chemical oxidation ( Huang et al, 2010 ; Kang et al, 2013 ; Chadha et al, 2014 ; Kumar et al, 2019a ) as well as charge rearrangement reactions ( Dhayagude et al, 2016 ; Das et al, 2019 ). Traces of drugs ( Edwin et al, 2017 ; Kumar et al, 2019b ), toxic heavy metal ions ( Wang et al, 2016 ; Guselnikova et al, 2017 ; Chadha et al, 2021a ), insecticides ( Dissanayake et al, 2019 ; Mane et al, 2020 ; Chadha et al, 2022 ), etc. can be detected using SERS, which also provides valuable structural and vibrational information pertaining to the metal-analyte interaction ( Thomas et al, 2013 ; SenGupta et al, 2014 ; Maiti et al, 2015 , Maiti et al, 2016 ; Das et al, 2019 ; Mirajkar et al, 2020 ).…”

Section: Introductionmentioning

confidence: 99%

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Conformational Selectivity of Merocyanine on Nanostructured Silver Films: Surface Enhanced Resonance Raman Scattering (SERRS) and Density Functional Theoretical (DFT) Study

et al. 2022

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In this study, detailed structural and vibrational analysis of merocyanine has been investigated using Raman, surface enhanced Raman scattering (SERS) and surface-enhanced resonance Raman scattering (SERRS). The Raman, SERS and SERRS studies aided by density functional theoretical (DFT) calculations clearly established the prevalence of the trans- and cis-conformers of the protonated form of merocyanine (MCH+) in solid and acetonitrile solution. The binding characteristics of merocyanine adsorbed on nanostructured silver-coated films (SCFs) were investigated using excitation-dependent SERS, concentration-dependent SERRS and DFT studies. The conformers of merocyanine involved in the surface adsorption processes were recognized. The prominent marker bands observed at 1538 (ethylenic C=C stretch) and 1133 cm−1 (pyridinium C-N stretch) in the Raman spectrum of merocyanine in acetonitrile shifted to 1540 and 1126 cm−1, respectively on the nanostructured SCFs. The shift in the marker bands is associated with either the preferential binding of selective conformer or change in resonance equilibrium between the benzenoid and quinoid forms. The excitation wavelength dependent SERS spectrum infers that in addition to the major contribution from the electromagnetic enhancement, chemical (resonance) effect leads to the amplification of the 1540 cm−1 band. The concentration-dependent SERRS study showed maximum enhancement for the nanostructured SCFs functionalized with 1 μM concentration of merocyanine, indicative of monolayer coverage. For lower concentrations of merocyanine, the SERRS signal intensity reduced without any alteration in the peak positions. The SERRS study thus, revealed sub-nanomolar (0.1 nM) sensing of merocyanine using nanostructured SCFs with the analytical enhancement factor (AEF) of ∼ 1010 for the 1126 cm−1 and 1540 cm−1 Raman bands for MC concentration of 0.1 nM. In this study, combination of SERRS and DFT have clearly established the predominance of trans-MCH+ on the nanostructured silver surface with minor contribution from cis-MCH+, which remain exclusively bound to the surface via the phenoxyl ring O atom. This conformational surface selectivity of geometrical isomers of merocyanine using nanostructured surfaces can be further explored for energy efficient and economical separation of geometrical isomers.

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“…The schematic synthesis of γ-CD-capped silver nanoparticles by chemical reduction is depicted in Figure 5. Recently, γ-CD-capped silver nanoparticles were investigated as nanoprobes for the detection of pesticides 104 The nanoparticles afford high stability for at least 3 months under storage in the dark. Analogous capped Au nanoparticles were also synthesized.…”

Section: Gamma-cds/agnpsmentioning

confidence: 99%

An overview on the role of cyclodextrins in the synthesis of silver nanoparticles by chemical reduction

Gasbarri¹,

Angelini²

2022

Arkivoc

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The association between cyclodextrins (CDs) and silver nanoparticles (AgNPs) has been successfully exploited in a large number of applications. Generally, CDs act as stabilizers, however, their reactivity as reducing agents can be directly involved in the synthesis of AgNPs. Herein, the most recent results regarding AgNPs prepared by chemical reduction from native α-, β-and γ-cyclodextrins are reported. The behavior of CDs in host-guest inclusion complexes onto the metal surface, and the effects on the AgNPs properties have also been examined. Unlike β-CD/AgNPs and γ-CD/AgNPs, additional reducing agents were required for the investigated α-CD/AgNPs.

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γ-Cyclodextrin capped silver and gold nanoparticles as colorimetric and Raman sensor for detecting traces of pesticide “Chlorpyrifos” in fruits and vegetables

Cited by 23 publications

References 73 publications

Plasmonic Nanostars: Systematic Review of their Synthesis and Applications

Plasmonic Nanostars: Systematic Review of their Synthesis and Applications

Conformational Selectivity of Merocyanine on Nanostructured Silver Films: Surface Enhanced Resonance Raman Scattering (SERRS) and Density Functional Theoretical (DFT) Study

An overview on the role of cyclodextrins in the synthesis of silver nanoparticles by chemical reduction

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