Stepwise Preparation of Spherical Gold Nanoparticles Passivated with Cationic Amphiphiles

Inoue, Yuki; Tsutamoto, Yo; Muko, Daiki; Nanamura, Kazuaki; Sawada, Tsuyoshi; Niidome, Yasuro

doi:10.2116/analsci.32.875

Cited by 8 publications

(3 citation statements)

References 21 publications

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“…These results complement Kool et al's reports of a Au nanoparticle:poly(vinyl alcohol) (PVA) nanocomposite that was used to 3D print a plastic analogue of the famous Lycurgus Cup. 73 We synthesized two types of Au colloidal nanoparticles, 10 nm spheres and 25 nm × 53 nm nanorods (Figure 4a−c), using CTAB as the surfactant and following the methods reported by Inoue et al 74 and Niu et al, 75 respectively (for details see SI section 1). We then mixed the nanoparticle dispersion with PLA (Au spheres) and PMMA (Au rods) powder.…”

Section: Plasmonic Plastics For Additive Manufacturing Of 3d Plasmoni...mentioning

confidence: 99%

Bulk-Processed Plasmonic Plastic Nanocomposite Materials for Optical Hydrogen Detection

et al. 2023

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Conspectus Sensors are ubiquitous, and their importance is only going to increase across many areas of modern technology. In this respect, hydrogen gas (H2) sensors are no exception since they allow mitigation of the inherent safety risks associated with mixtures of H2 and air. The deployment of H2 technologies is rapidly accelerating in emerging energy, transport, and green steel-making sectors, where not only safety but also process monitoring sensors are in high demand. To meet this demand, cost-effective and scalable routes for mass production of sensing materials are required. Here, the state-of-the-art often resorts to processes derived from the microelectronics industry where surface-based micro- and nanofabrication are the methods of choice and where (H2) sensor manufacturing is no exception. In this Account, we discuss how our recent efforts to develop sensors based on plasmonic plastics may complement the current state-of-the-art. We explore a new H2 sensor paradigm, established through a series of recent publications, that combines (i) the plasmonic optical H2 detection principle and (ii) bulk-processed nanocomposite materials. In particular, plasmonic plastic nanocomposite sensing materials are described that comprise plasmonic H2-sensitive colloidally synthesized nanoparticles dispersed in a polymer matrix and enable the additive manufacturing of H2 sensors in a cost-effective and scalable way. We first discuss the concept of plasmonic plastic nanocomposite materials for the additive manufacturing of an active plasmonic sensing material on the basis of the three key components that require individual and concerted optimization: (i) the plasmonic sensing metal nanoparticles, (ii) the surfactant/stabilizer molecules on the nanoparticle surface from colloidal synthesis, and (iii) the polymer matrix. We then introduce the working principle of plasmonic H2 detection, which relies on the selective absorption of H species into hydride-forming metal nanoparticles that, in turn, induces distinct changes in their optical plasmonic signature in proportion to the H2 concentration in the local atmosphere. Subsequently, we assess the roles of the key components of a plasmonic plastic for H2 sensing, where we have established that (i) alloying Pd with Au and Cu eliminates hysteresis and introduces intrinsic deactivation resistance at ambient conditions, (ii) surfactant/stabilizer molecules can significantly accelerate and decelerate H2 sorption and thus sensor response, and (iii) polymer coatings accelerate sensor response, reduce the limit of detection (LoD), and enable molecular filtering for sensor operation in chemically challenging environments. Based on these insights, we discuss the rational development and detailed characterization of bulk-processed plasmonic plastics based on glassy and fluorinated matrix polymers and on tailored flow-chemistry-based synthesis of Pd and PdAu alloy colloidal nanoparticles with optimized stabilizer molecules. In their champion implementation, they enable highly stable H2 sen...

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Section: Plasmonic Plastics For Additive Manufacturing Of 3d Plasmoni...mentioning

confidence: 99%

Bulk-Processed Plasmonic Plastic Nanocomposite Materials for Optical Hydrogen Detection

et al. 2023

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“…A characteristic feature of gold nanoparticles is a surface plasmon resonance in the visible range of the light, which depends, amongst others, on the element, the size and shape of the metal core, [1–4] as well as the dielectric properties of the surrounding medium [5–9] . Besides, gold exhibits a relatively high chemical stability, which enables long storage of nanoparticle dispersions and is therefore crucial for most applications [10,11] . Especially anisotropic gold nanoparticles are of particular interest because their optical, electromagnetic and catalytic properties often differ from spherical ones [12] .…”

Section: Introductionmentioning

confidence: 99%

Fitting A Square Peg into A Round Hole: Shape Control in Phase Transfer of Cubic Gold Nanoparticles

et al. 2021

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Although nanomaterials are widely involved in technological applications, common synthetic recipes for such colloids are restricted to special, optimized conditions, particularly for anisotropic shapes. Ligand exchange is frequently necessary for further functionalization. While such protocols are well established for spherical particles, it is more demanding to keep the corpus for thermodynamically less stable shapes. We highlight the temperature as one key for the formation of anisotropic gold nanoparticles, but also for ligand exchange protocols under shape retention or deliberate reshaping at the example of gold nanocubes. In the first part, the synthesis of CTAB capped gold nanocubes in aqueous solution is examined highlighting the narrow temperature window in which selective adsorption site blocking by bromide ions leads to the formation of gold nanocubes. While too low temperatures yield multiple particle shapes due to a low surface mobility, temperatures above the appropriate window result in more thermodynamically favored shapes. Furthermore, two protocols are presented for the exchange of the ammonium ligand CTAB by oleylamine as an organic amine including water removal from a slurrish water‐amine paste through the gas phase. In turn, precise temperature control allows to either maintain the cubic shape or induce a reshaping process towards other, thermodynamically preferred shapes such as for example truncated octahedra.

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“…To examine whether the attachment on the CdS NR affects the width the Au plasmon band, we also prepared colloidal gold particles (without CdS) of similar diameters following a published procedure (see Section SI1 and Figure S3A−C). 40,41 Their UV−vis absorption spectra (Figure S3D−F) show that the widths of their plasmon band also change with size and these spectra can be fitted by a sum of the SPR band and interband transition. The details of fitting procedures for both Au nanoparticles and CdS−Au NRs are described in Section SI2.…”

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confidence: 99%

Efficient Hot Electron Transfer from Small Au Nanoparticles

et al. 2020

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Many important chemical transformations enabled by plasmonic hot carrier photocatalysis have been reported, although their efficiencies are often too low for practical applications. We examine how the efficiency of plasmon-induced hot electron transfer depends on the Au particle size in Au-tipped CdS nanorods. We show that with decreasing Au size, the plasmon width increases due to enhanced surface damping contributions. The excitation of Au nanoparticles leads to an instrument response time-limited ultrafast hot electron transfer process to CdS (≪140 fs). The quantum efficiency of this process increases from ∼1% to ∼18% as the particle size decreases from 5.5 ± 1.1 to 1.6 ± 0.5 nm due to both enhanced hot electron generation and transfer efficiencies in small Au particles. Our finding suggests that decreasing plasmonic particle size is an effective approach for improving plasmon-induced hot carrier transfer efficiency and provides important insight for the rational improvement of plasmonic hot carrier-based devices.

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Stepwise Preparation of Spherical Gold Nanoparticles Passivated with Cationic Amphiphiles

Cited by 8 publications

References 21 publications

Bulk-Processed Plasmonic Plastic Nanocomposite Materials for Optical Hydrogen Detection

Bulk-Processed Plasmonic Plastic Nanocomposite Materials for Optical Hydrogen Detection

Fitting A Square Peg into A Round Hole: Shape Control in Phase Transfer of Cubic Gold Nanoparticles

Efficient Hot Electron Transfer from Small Au Nanoparticles

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