Robust synthesis of gold rhombic dodecahedra with well-controlled sizes and their optical properties

The utilization of localized surface plasmon resonance (LSPR) from plasmonic noble metals in combination with semiconductors promises great improvements for visible light-driven photocatalysis, in particular for energy conversion. This review summarizes the basic principles of plasmonic photocatalysis, giving a comprehensive overview about the proposed mechanisms for enhancing the performance of photocatalytically active semiconductors with plasmonic devices and their applications for surface plasmon-assisted solar energy conversion. The main focus is on gold and, to a lesser extent, silver nanoparticles in combination with titania as semiconductor and their usage as active plasmonic photocatalysts. Recent advances in water splitting, hydrogen generation with sacrificial organic compounds, and CO2 reduction to hydrocarbons for solar fuel production are highlighted. Finally, further improvements for plasmonic photocatalysts, regarding performance, stability, and economic feasibility, are discussed for surface plasmon-assisted solar energy conversion.

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“…Figure 2 shows extinction spectra of Au rhombic dodecahedra [87] (Fig. 2a) and Ag nanocubes [88] (Fig.…”

Section: Principles Of Localized Surface Plasmon Resonancementioning

confidence: 99%

Surface Plasmon-Assisted Solar Energy Conversion

Dodekatos

Schünemann

Tüysüz

2015

Topics in Current Chemistry

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“…Intentionally, the reaction time after the addition of HAuCl4 was kept short ( As reported earlier, DMF can reduce HAuCl4 to generate Au nanocrystals ( 0 ), according to the following reaction: 21,[26][27] Dissolution of HAuCl4 in water: 23…”

Section: Effect Of : Time Of Haucl4-injection (Dc1mentioning

confidence: 99%

“…presented in Figures 5b and S5, revealed that the crystalline structure of the synthesized AuNPs decorated on the exfoliated 2H-MoS2 NSs is mainly dominated by the Au(111) face, due to the selective affinity of the citrate ions for Au(111). [27][28] As a result, low-index Au(111) facets are enlarged at the expense of high-index facets like Au(100) and Au(110) during crystal growth.…”

Section: Preferential Crystal Plane Growth Of Aunps On 2h-mos2 Nss Xmentioning

confidence: 99%

Organic Solvent Based Synthesis of Gold Nanoparticle−Semiconducting 2H-MoS₂ Hybrid Nanosheets

et al. 2019

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The development of simple, versatile strategies for the synthesis of gold nanoparticles (AuNPs) on semiconducting transition metal dichalcogenides (TMDC) layers is of increasing scientific and technological interest in photocatalysis, optical sensing, and optoelectronics sectors, but challenges exist on the nucleation and hybridization of AuNPs with the TMDC basal plane. At present, the widely used aqueous solution approaches suffer from poor dispersion of produced hybrids as well as from limited growth and coverage of the AuNPs on the TMDC semiconducting plane, since Au nanoclusters nucleate preferentially at the electron rich defect edges, which act as reducing agents and not on the defect free basal plane. Here, we report for the first time, the controlled synthesis of AuNPs on the basal plane of semiconducting molybdenum disulfide nanosheets (2H-MoS2 NSs) via a N,N-dimethylformamide (DMF)-based hot-injection synthesis route. This organic solvent-based synthesis route eliminates problems of poor dispersion of AuNPs@2H-MoS2 NS hybrids, whereas at the same time maintains the semiconducting crystalline quality of the pristine 2H-MoS2 NSs. In addition, the study establishes the important role of trisodium citrate, on enhancing the nucleation and improving the hybridization of AuNPs on 2H-MoS2 NSs as evidenced by the induced p-type doping. This organic solvent synthesis approach can be adopted for other hybrid systems opening the way for controlled hybridization of semiconducting layers with metal nanoparticles. 4 MoS2 NSs of metallic phase (M-MoS2), produced by Li intercalation, where dominance of defects on the basal plane promoted the MoS2/ + redox reaction. 2-3 Nevertheless, many applications such as photocatalysis, optical sensing, and optoelectronics, favor the presence of a semiconducting-TMDC/metallic-NP interface to increase absorption, enhance photogeneration rate and/or achieve light induced charge separation. 15 As a result, the growth of AuNPs on semiconducting 2H-MoS2 is been sought. However, whereas the anchoring of AuNPs on M-MoS2 has been explored thoroughly, 2-3 strategies for synthesis of AuNPs on semiconducting 2H phase TMDCs (2H-TMDC), (AuNPs@2H-TMDC), are currently at incipient stages. 10, 16 To tackle this challenge, routes for producing solvent-dispersible hybrids, with a controlled nucleation and coverage of AuNPs on the 2H-TMDC basal plane are being avidly sought.Recently, the functionalization of 2H-TMDC, using chemical reactions of gold precursors in aqueous solution, has been explored. 16 However, the Au-nucleation was limited mainly at the electron rich edges, 16 due to the absence of highly energetic defects on the basal plane, whereas the efficient synthesis of hybrids was hindered by the poor dispersion of semiconducting 2H-MoS2 NSs in water. Lately, we reported the production of 2H-MoS2 NSs, via room temperature ionic liquid (RTIL) assisted grinding method combined with sequential centrifugation steps. 17 Such mechanically exfoliated 2H-MoS2 NSs retain their crystalline quality aft...

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“…All three different shapes of Au nanoparticles were synthesized by the seed-mediated synthesis method using as-prepared 11 nm spherical Au seeds. In a typical synthesis of 60 nm Au rhombic dodecahedra nanoparticles, 0.3 ml of the 11 nm Au seed solution was injected into a mixture of 0.3 ml of 0.5 M sodium citrate tribasic in 0.14 ml of de-ionized water, 1.0 ml of 9.42 mM HAuCl 4 , 0.8 ml of 0.0025 mM PVP and 9.6 ml DMF in a 50 ml glass vial (Choi et al 2013). The vial was then capped and heated to 80 ℃ in an oil bath with a magnetic stir bar for 2 h.…”

Section: Synthesis Of Au Rhombic Dodecahedra Sphere Octahedra Nanopmentioning

confidence: 99%

“…100 nm Au sphere nanoparticles were also synthesized using a procedure similar to that used for the Au rhombic dodecahedra nanoparticles, except that 0.16 ml of the 11 nm Au seed solution was added into the reaction solution, in a 120°C oil bath (Choi et al 2013).…”

Section: Synthesis Of Au Rhombic Dodecahedra Sphere Octahedra Nanopmentioning

confidence: 99%

Fabrication of shape-controlled Au nanoparticle arrays for SERS substrates

Shin¹,

Choi²,

Ye³

et al. 2014

Advances in materials Research

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Surface enhanced Raman Scattering (SERS) has attracted attention because the technique enables detection of various chemicals, even down to single molecular scale. Among the diverse candidates for SERS substrates, Au nanoparticles are considered promising due to their fine optical properties, chemical stability and ease of surface modification. Therefore, the fabrication and optical characterization of gold particles on solid supports is highly desirable. Such structures have potential as SERS substrates because the localized surface plasmon resonance of gold nanoparticles is very sensitive to combined molecules and environments. In addition, it is well-known that the properties of Au nanoparticles are strongly dependent on their shape. In this work, arrays of shape-controlled Au nanoparticles were fabricated to exploit their enhanced and reproducible optical properties. First, shape-controlled Au nanoparticles were prepared via seed mediated solution-phase synthesis, including spheres, octahedra, and rhombic dodecahedra. Then, these shape-controlled Au nanoparticles were arranged on a PDMS substrate, which was nanopatterned using soft lithography of poly styrene particles. The Au nanoparticles were selectively located in a pattern of hexagonal spheres. In addition, the shape-controlled Au nanoparticles were arranged in various sizes of PDMS nanopatterns, which can be easily controlled by manipulating the size of polystyrene particles. Finally, the optical properties of the fabricated Au nanoparticle arrays were characterized by measuring surface enhanced Raman spectra with 4-nitrobenezenethiol.

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Robust synthesis of gold rhombic dodecahedra with well-controlled sizes and their optical properties

Cited by 21 publications

References 34 publications

Surface Plasmon-Assisted Solar Energy Conversion

Surface Plasmon-Assisted Solar Energy Conversion

Organic Solvent Based Synthesis of Gold Nanoparticle−Semiconducting 2H-MoS₂ Hybrid Nanosheets

Fabrication of shape-controlled Au nanoparticle arrays for SERS substrates

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Robust synthesis of gold rhombic dodecahedra with well-controlled sizes and their optical properties

Cited by 21 publications

References 34 publications

Surface Plasmon-Assisted Solar Energy Conversion

Surface Plasmon-Assisted Solar Energy Conversion

Organic Solvent Based Synthesis of Gold Nanoparticle−Semiconducting 2H-MoS2 Hybrid Nanosheets

Fabrication of shape-controlled Au nanoparticle arrays for SERS substrates

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Product

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Organic Solvent Based Synthesis of Gold Nanoparticle−Semiconducting 2H-MoS₂ Hybrid Nanosheets