Fluorescence enhancement of the conjugated polymer films based on well-ordered Au nanoparticle arrays

Zhong, Benbin; Zu, Xihong; Yi, Guobin; Huang, Hailiang; Zhang, Minghai; Luo, Hongsheng

doi:10.1007/s11051-016-3588-6

Cited by 9 publications

(8 citation statements)

References 32 publications

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“…The PSb-P4VP diblock copolymer micelles solution was obtained according to our previous literature. 41 More specifically, PS-b-P4VP diblock copolymers were dissolved in toluene and stirred at 75 °C for 3 h. For PS-b-P4VP diblock copolymers, toluene was a good solvent for PS blocks but nonsolvent for P4VP blocks. Therefore, PS-b-P4VP diblock copolymer micelles composed of a PS corona and a P4VP core were formed in toluene.…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

Fabrication of Au Nanoparticle Arrays on Flexible Substrate for Tunable Localized Surface Plasmon Resonance

Tang

et al. 2021

ACS Appl. Mater. Interfaces

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In this work, Au nanoparticle (AuNP) arrays on shape memory polyurethane (SMPU) substrates serve as flexible materials for tunable localized surface plasmon resonance (LSPR). AuNP arrays prepared by diblock copolymer self-assembly are transferred from rigid silicon wafers onto flexible SMPU substrates with ultrasonic treatment rather than peeling off directly. The resultant AuNP array SMPU films have excellent mechanical properties and stable thermodynamic properties. The LSPR arising from AuNP arrays is increased by negative bending on SMPU substrates, whereas the LSPR is decreased by positive bending. Besides, upon uniaxial tension, the vertical LSPR is increased first then decreased, whereas the parallel LSPR is similar, resulting in the overall LSPR of AuNP arrays being increased first and then decreased with the mechanical uniaxial tension of SMPU. Moreover, the resultant AuNP array SMPU films exhibit excellent flexibility, stability, and homogeneity in practical surface-enhanced Raman scattering (SERS) application. This approach of incorporating AuNP arrays on SMPU substrates for tuning plasmonic properties have great potential applications in SERS, fluorescence enhancement, and newly optoelectronic materials.

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Section: ■ Materials and Methodsmentioning

confidence: 99%

Fabrication of Au Nanoparticle Arrays on Flexible Substrate for Tunable Localized Surface Plasmon Resonance

Tang

et al. 2021

ACS Appl. Mater. Interfaces

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“…Preparation of Au NP Arrays: Au NP arrays were prepared by block copolymer self-assembly. [10] Briefly, a PS-b-P4VP diblock copolymer micelle solution was prepared by adding PS-b-P4VP to toluene (0.5 wt%). After stirring for 3 h at 75 °C, HAuCl 4 •3H 2 O was added to the prepared PS-b-P4VP block copolymer micelle solution and stirred for 24 h at room temperature.…”

Section: Methodsmentioning

confidence: 99%

“…For the AuNP array SERS substrate, the peak at 525 nm was assigned to the plasmon resonance of the AuNP arrays. [10] In comparison, the plasmonic peak arising from the AuNP arrays for the FDPS substrate slightly shifted from 525 to 528 nm, which was attributed to the plasmonic coupling from the aligned AgNWs to AuNPs. [9a] However, the plasmonic peaks of AgNWs at 351 and 377 nm were observed without shift, [11] which was associated with the higher content of Ag and lower content of Au (Figure S2, Supporting Information).…”

Section: Fabrication and Characterization Of The Fdps Substratementioning

confidence: 99%

“…[11] Similarly, an enhanced electromagnetic field occurred at the spacing between adjacent AuNPs. [10] Unlike AuNPs that grow on the surface of AgNWs directly, the thin layer of PU covering the aligned AgNWs prevented direct contact between the AuNPs and AgNWs, which ensured their strong plasmonic coupling. [9a] As a result, a large electromagnetic field enhancement was achieved, which resulted in a higher SERS activity.…”

Section: Sers Activity Of the Fdps Substratementioning

confidence: 99%

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Au‐Nanoparticle‐Array/Aligned‐Ag‐Nanowire‐Based Flexible Dual Plasmonic Substrate for Sensitive Surface‐Enhanced Raman Scattering Detection

Tang

Liu

et al. 2021

Part & Part Syst Charact

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The hot spot density is increased with the result that the Raman signals of molecules absorbed on the noble metallic nanostructures can be significantly enhanced. The noble metal Ag is an ideal candidate for electromagnetic enhancement in SERS because of its excellent SPR. However, the low stability of Ag is the largest challenge for electromagnetic enhancement, as it can be easily oxidized upon exposure to air, which reduces the detection limit of SERS. The noble metal Au exhibits a high stability and good biocompatibility although its SERS activity is inferior to that of Ag. [7] Thus, dual plasmonic structures combined with Ag and Au as SERS substrates are expected to improve the stability and sensitivity of SERS.Generally, dual plasmonic structures combined with Ag and Au are achieved by the galvanic replacement reaction of Ag with Au 3+ . The random distribution and inconsistent size of Au nanoparticles (AuNPs) on the Ag surface hinder the control of the adjacent gap. As a result, their SERS sensitivity is not effectively improved. In particular, the AuNPs on the surface of Ag nanowires (AgNWs) obtained by the galvanic replacement reaction weaken the propagating surface plasmon resonance (PSPR) effect of AgNWs, which is unfavorable for a high SERS sensitivity. [8] When rigid dual plasmonic SERS substrates are applied on uneven and irregular detecting surfaces, the dual plasmonic structures are destroyed, leading to decreased SERS sensitivity and reproducibility. By contrast, dual plasmonic structures incorporated into flexible substrates have excellent mechanical properties, antidamage characteristic, portability, and tailorability, which enable the detection of target molecules on an uneven and irregular surface. [9] Therefore, the development of strategies for the fabrication of dual plasmonic structures and introduction of flexible substrates are important for the development of sensitive and reproducible SERS detection.In this study, we demonstrate a flexible dual plasmonic SERS (FDPS) substrate with high SERS sensitivity and reproducibility, which is composed of aligned AgNWs and AuNP arrays separated by a thin polyurethane (PU) layer. The FDPS substrate achieved a high SERS activity with a detection limitThe fabrication of flexible surface-enhanced Raman scattering (SERS) substrates for sensitive detection on uneven or irregular surfaces is challenging. In this study, a flexible dual plasmonic SERS (FDPS) substrate rationally constructed using Au nanoparticle (AuNP) arrays/aligned Ag nanowires (AgNWs) and elastic polyurethane (PU) is demonstrated. It exhibits high sensitivity (detection limit of 10 −8 m for melamine and 10 −10 m for malachite green) and excellent reproducibility. The well-designed structure of AuNP arrays/aligned AgNWs fabricated using block copolymer self-assembly and oil-water-air interfacial self-assembly successfully enhances the electromagnetic field through plasmonic coupling. In addition, the FDPS substrate retains a high SERS sensitivity after exposure to air at room temperat...

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“…Recent advances in nanotechnology have been rapid, and have led to the fabrication of nanostructures of different geometrical symmetry [1][2][3][4]. These quantum structures can be employed to realize a plethora of devices which utilize different properties of the quantum structures to perform various functions.…”

Section: Introductionmentioning

confidence: 99%

Optical Transition Rates in a Cylindrical Quantum Wire with an Inverse Parabolic Potential

2029

ATCP

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Electron transition rates due to interaction with circularly polarized light incident along the axis of a free-standing solid cylindrical nanowire are evaluated in the dipole approximation. In this case, the allowed optical transitions are only those for which the azimuthal quantum numbers of the initial and final states differ by unity. The envisaged electric potential of the quantum wire is modeled as inversely parabolic in the radial distance and such that it assumes a value of zero at the surface of the nanostructure. The investigations here are on the influence of this form of the confining potential on the transition rates involving some few electrons’ states of higher radial quantum numbers, nonetheless limited to transitions only between a pair of the electron’s energy sub bands. It is found that a sweep of the strength of the potential gives rise to modulations of the optical transition rates for higher radial quantum numbers. Furthermore, an increase of the strength of this potential reduces the transition energies thus such an increase redshifts peaks of the corresponding transitions rates.

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Fluorescence enhancement of the conjugated polymer films based on well-ordered Au nanoparticle arrays

Cited by 9 publications

References 32 publications

Fabrication of Au Nanoparticle Arrays on Flexible Substrate for Tunable Localized Surface Plasmon Resonance

Fabrication of Au Nanoparticle Arrays on Flexible Substrate for Tunable Localized Surface Plasmon Resonance

Au‐Nanoparticle‐Array/Aligned‐Ag‐Nanowire‐Based Flexible Dual Plasmonic Substrate for Sensitive Surface‐Enhanced Raman Scattering Detection

Optical Transition Rates in a Cylindrical Quantum Wire with an Inverse Parabolic Potential

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