Comparative study of block copolymer-templated localized surface plasmon resonance optical fiber biosensors: CTAB or citrate-stabilized gold nanorods

Lu, Mengdi; Zhu, Hu; Lin, Ming; Wang, Fang; Hong, Long; Masson, Jean-François; Peng, Wei

doi:10.1016/j.snb.2020.129094

Cited by 20 publications

(10 citation statements)

References 49 publications

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“…In 2021, a new method using spherical gold nanoparticles [ 46 ] and gold nanorods [ 48 ] to prepare self-assembly templates by block copolymer (BCP) and surfactant modification further improved the electrostatic self-assembly method. The cationic surfactant CTAB was used in the AuNR growth solution.…”

Section: Sensing Principle and Combinationmentioning

confidence: 99%

“…( c ) Schematic diagram of ZnO nanowires and AuNPs composite structure [ 66 ]. Copyright 2023, Elsevier; ( d ) Schematic diagram of the PS-b-P4VP-templated citrate-AuNR monolayer [ 48 ]. Copyright 2023, Elsevier.…”

Section: Structure Classification and Application Of Lspr Fiber-optic...mentioning

confidence: 99%

“…RI sensitivity and specificity detection limits were improved by 171% and 404%, respectively. In another study, Lu et al [ 48 ] fabricated an innovative new self-assembled template method to fabricate LSPR biosensors. A novel self-assembled template was prepared by surfactant modification and layer-by-layer electrostatic self-assembly for human IgG detection, as shown in Figure 6 d. The results showed that compared with the traditional preparation method, the sensitivity of the new method was increased by 1.5 times.…”

Section: Structure Classification and Application Of Lspr Fiber-optic...mentioning

confidence: 99%

“… ( a ) The method of increasing the volume of gold nanoparticles by the secondary immersion in citrate; ( b ) Comparison of the BCP method with traditional electrostatic self-assembly and silane method [ 48 ]. Copyright 2023, Elsevier.…”

Section: Figurementioning

confidence: 99%

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Recent Advancements of LSPR Fiber-Optic Biosensing: Combination Methods, Structure, and Prospects

Zhang

Zhou

et al. 2023

Biosensors

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Fiber-optic biosensors based on localized surface plasmon resonance (LSPR) have the advantages of great biocompatibility, label-free, strong stability, and real-time monitoring of various analytes. LSPR fiber-optic biosensors have attracted extensive research attention in the fields of environmental science, clinical medicine, disease diagnosis, and food safety. The latest development of LSPR fiber-optic biosensors in recent years has focused on the detection of clinical disease markers and the detection of various toxic substances in the environment and the progress of new sensitization mechanisms in LSPR fiber-optic sensors. Therefore, this paper reviews the LSPR fiber-optic sensors from the aspects of working principle, structure, and application fields in biosensors. According to the structure, the sensor can be divided into three categories: traditional ordinary optical fiber, special shape optical fiber, and specialty optical fiber. The advantages and disadvantages of existing and future LSPR fiber-optic biosensors are discussed in detail. Additionally, the prospect of future development of fiber-optic biosensors based on LSPR is addressed.

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Section: Sensing Principle and Combinationmentioning

confidence: 99%

Section: Structure Classification and Application Of Lspr Fiber-optic...mentioning

confidence: 99%

Section: Structure Classification and Application Of Lspr Fiber-optic...mentioning

confidence: 99%

Section: Figurementioning

confidence: 99%

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Recent Advancements of LSPR Fiber-Optic Biosensing: Combination Methods, Structure, and Prospects

Zhang

Zhou

et al. 2023

Biosensors

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“…20 Another sensing platform benefiting from the BCP brush template is optical fiber-based localized surface plasmon resonance (LSPR) sensors. 23−25 The dense array of well-dispersed AuNPs (10−90 nm) 25 and nanorods 23,24 on BCP brushdecorated optical fibers significantly improved their sensitivity, thanks to negligible AuNP aggregation compared to organosilane and polymer templates. 25 It was also demonstrated that by replacing the P4VP block with a poly(acrylic acid) block, the brush template can be adapted to accommodate positively charged cetrimonium bromide-capped AuNPs.…”

Section: ■ Introductionmentioning

confidence: 99%

Monolayer Arrays of Au Nanoparticles on Block Copolymer Brush Films for Optical Devices and Biosensors

Zhu,

Masson,

Bazuin

2024

ACS Appl. Nano Mater.

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Gold nanoparticle (AuNP) monolayers possess unique optical properties and are widely used in optical devices and biosensors, sometimes necessitating dense but nonclosepacked monolayers. Current self-assembly methods are generally limited to small surfaces and are often plagued by AuNP aggregation. Here, we use a facile method, suitable for substrates of any size or form, to produce dense, unaggregated, randomly packed AuNP monolayers on brushlike films of polystyrene-block-poly(4-vinylpyridine) (PS-P4VP) obtained by dip-coating flat surfaces from very dilute solutions, where PS forms the brush, and the citrate-stabilized AuNPs interact with the P4VP anchoring layer when the template is incubated in an AuNP colloid. By investigating the effect of molecular weight (M n ), dip-coating solvent, and colloid pH on the characteristics of the adsorbed films and the subsequent deposition of AuNPs, we constructed a morphology map in terms of PS M n and chain grafting density under favorable pH conditions, showing the region that yields the desired dense well-dispersed AuNP monolayers. Above an upper PS M n boundary (around 50−60 kg/mol), the PS brush�continuous or in the form of patches�is too thick and rigid for the AuNPs to access the underlying P4VP and is also subject to kinetic effects, thus causing little or nonuniform, even aggregated, AuNP deposition. These findings have important implications for the future employment of dense, unaggregated AuNP monolayers in miniature sensors and as optical coatings in a wide range of optical devices.

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Nano‐Photonic Crystal D‐Shaped Fiber Devices for Label‐Free Biosensing at the Attomolar Limit of Detection

Del Villar,

Gonzalez‐Valencia,

Kwietniewski

et al. 2024

Advanced Science

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Maintaining both high sensitivity and large figure of merit (FoM) is crucial in regard to the performance of optical devices, particularly when they are intended for use as biosensors with extremely low limit of detection (LoD). Here, a stack of nano‐assembled layers in the form of 1D photonic crystal, deposited on D‐shaped single‐mode fibers, is created to meet these criteria, resulting in the generation of Bloch surface wave resonances. The increase in the contrast between high and low refractive index (RI) nano‐layers, along with the reduction of losses, enables not only to achieve high sensitivity, but also a narrowed resonance bandwidth, leading to a significant enhancement in the FoM. Preliminary testing for bulk RI sensitivity is carried out, and the effect of an additional nano‐layer that mimics a biological layer where binding interactions occur is also considered. Finally, the biosensing capability is assessed by detecting immunoglobulin G in serum at very low concentrations, and a record LoD of 70 aM is achieved. An optical fiber biosensor that is capable of attaining extraordinarily low LoD in the attomolar range is not only a remarkable technical outcome, but can also be envisaged as a powerful tool for early diagnosis of diseases.

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Comparative study of block copolymer-templated localized surface plasmon resonance optical fiber biosensors: CTAB or citrate-stabilized gold nanorods

Cited by 20 publications

References 49 publications

Recent Advancements of LSPR Fiber-Optic Biosensing: Combination Methods, Structure, and Prospects

Recent Advancements of LSPR Fiber-Optic Biosensing: Combination Methods, Structure, and Prospects

Monolayer Arrays of Au Nanoparticles on Block Copolymer Brush Films for Optical Devices and Biosensors

Nano‐Photonic Crystal D‐Shaped Fiber Devices for Label‐Free Biosensing at the Attomolar Limit of Detection

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