The finite-difference time-domain (FDTD) guided preparation of Ag nanostructures on Ti substrate for sensitive SERS detection of small molecules

Sun, Guanghui; Fu, Cuicui; Dong, Mengmeng; Jin, Guangxia; Song, Qijun

doi:10.1016/j.saa.2021.120743

Cited by 14 publications

(4 citation statements)

References 44 publications

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“…The theoretical method used in this article for solving electromagnetic problems was the finite-difference time-domain (FDTD) method [ 22 , 23 , 24 , 25 ]. As first proposed by Yee in 1966 [ 26 ], this method is a simple and direct way to discretize the differential form of Maxwell’s equations.…”

Section: Theoretical Methods and Computational Modelmentioning

confidence: 99%

Optical Control of the Localized Surface Plasmon Resonance in a Heterotype and Hollow Gold Nanosheet

Chen

Yin

et al. 2023

Nanomaterials

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The remote excitation and remote-controlling of the localized surface plasmon resonance (LSPR) in a heterotype and hollow gold nanosheet (HGNS) is studied using FDTD simulations. The heterotype HGNS contains an equilateral and hollow triangle in the center of a special hexagon, which forms a so-called hexagon–triangle (H–T) heterotype HGNS. If we focus the incident-exciting laser on one of the vertexes of the center triangle, the LSPR could be achieved among other remote vertexes of the outer hexagon. The LSPR wavelength and peak intensity depend sensitively on factors such as the polarization of the incident light, the size and symmetry of the H–T heterotype structure, etc. Several groups of the optimized parameters were screened out from numerous FDTD calculations, which help to further obtain some significant polar plots of the polarization-dependent LSPR peak intensity with two-petal, four-petal or six-petal patterns. Remarkably, based on these polar plots, the on-off switching of the LSPR coupled among four HGNS hotspots could be remote-controlled simply via only one polarized light, which shows promise for its potential application in remote-controllable surface-enhanced Raman scattering (SERS), optical interconnects and multi-channel waveguide switches.

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Section: Theoretical Methods and Computational Modelmentioning

confidence: 99%

Optical Control of the Localized Surface Plasmon Resonance in a Heterotype and Hollow Gold Nanosheet

Chen

Yin

et al. 2023

Nanomaterials

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“…2,6,23 Naturally, some microbial strains like Rhodococcus bacteria are known to reduce PA contamination in soil. 24 To avoid unlawful acts with explosives, commercially advanced spectroscopic methods, such as ionmobility spectrometry (IMS), 25 chromatography, 26,27 electrochemical methods SERS, 28 X-ray imaging, 29,30 etc. have been employed.…”

Section: Introductionmentioning

confidence: 99%

“…A great effort has been made recently to design and develop effective methods for the detection of explosive species related to military affairs, homeland protection, forensic investigations, and for environment protection. ,, Naturally, some microbial strains like Rhodococcus bacteria are known to reduce PA contamination in soil . To avoid unlawful acts with explosives, commercially advanced spectroscopic methods, such as ion-mobility spectrometry (IMS), chromatography, , electrochemical methods SERS, X-ray imaging, , etc. have been employed.…”

Section: Introductionmentioning

confidence: 99%

An Imidazole-Naphthalimide-Based pH-Sensitive Molecular Probe for Selective Detection of Picric Acid and Cell Imaging

Rai,

Bhandari,

Kaleem

et al. 2024

Ind. Eng. Chem. Res.

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A new naphthalimide core containing molecular probe has been designed and synthesized. The photophysical properties of the probe in solvents of different polarities showed solvatochromic behavior. Probe displayed a weak aggregation-induced emission in THF–water (fw; 80%–90%) with a blue shift. Studies under a wide pH range (HEPES buffer) displayed significant fluorescence quenching under acidic medium. Probe showed “Off–On” behavior under acid and alkaline conditions. Probe upon interaction with different classes of ions and nitroaromatic compounds (NACs) displayed remarkable fluorescence quenching (switched-Off) with picric acid (PA) selectively in aqueous-THF (9:1, v/v) solution. Similarly, upon interaction with different biomolecules and anions, a probable complex of probe with picric acid (5.PA) showed enhanced emission with uric acid (UA) selectively. Interestingly, the quenched emission of 5.PA was rejuvenated upon interaction with UA and the OH– ion. Job’s plot analysis revealed a 1:2 binding stoichiometry between probe and PA with a binding constant of 2.26 × 108 M–2 and a limit of detection (LOD) of 1.19 × 10–7 M (119 nM). Also, the 5.PA could able to detect UA with an LOD of 3.05 × 10–7 (305 nM). The optical behavior of the probe was utilized to detect the PA and UA on test paper strips through color changes that are visible with the naked eye. Additionally, the cell imaging studies showed affinity of the probe for lysosomes as well as the ability to detect PA sensitively. The “On–Off” switching behavior of the probe upon providing sequential chemical inputs of PA and OH– ion mimics the “write–read–erase–read” functions and IMPLICATION logic gate.

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“…Surface-enhanced Raman scattering (SERS) can achieve ultra-sensitive detection of target molecules, and it has been used in various professional fields [1][2][3][4]. Due to its label-free analysis capability, SERS can be applied in various fields such as food safety, environmental monitoring, biomedicine, agricultural, military, and explosives testing [5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

A copper foam-based surface-enhanced Raman scattering substrate for glucose detection

Wang

Jia

et al. 2023

Discover Nano

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Raman spectroscopy can quickly achieve non-destructive, qualitative and quantitative detection, and analysis the molecular structure of substances. Herein, a facile and low-cost method for preparation of highly sensitivity SERS substrates was implemented through the displacement reaction of copper foam immersed in AgNO3 ethanol solution. Due to the 3D structure of copper film and homogenous displacement, the Ag–Cu substrate showed high performance SERS enhancement (1.25 × 107), and the lowest detection concentration for R6G reached 10–10 Mol/L. For glucose detection, mixed decanethiol (DT)/mercaptohexanol (MH) interlayer was used to enable glucose attach to the substrate surface, and the limit of detection reached to 1 uM/L. SERS substrate makes the Ag–Cu SERS substrate promising for biological applications.

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The finite-difference time-domain (FDTD) guided preparation of Ag nanostructures on Ti substrate for sensitive SERS detection of small molecules

Cited by 14 publications

References 44 publications

Optical Control of the Localized Surface Plasmon Resonance in a Heterotype and Hollow Gold Nanosheet

Optical Control of the Localized Surface Plasmon Resonance in a Heterotype and Hollow Gold Nanosheet

An Imidazole-Naphthalimide-Based pH-Sensitive Molecular Probe for Selective Detection of Picric Acid and Cell Imaging

A copper foam-based surface-enhanced Raman scattering substrate for glucose detection

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