Ag@SiO<sub>2</sub> Core–Shell Nanostructures: Distance-Dependent Plasmon Coupling and SERS Investigation

Shanthil, M.; Thomas, Reshmi; Swathi, Rotti Srinivasamurthy; Thomas, K. George

doi:10.1021/jz3004014

Cited by 182 publications

(166 citation statements)

References 35 publications

(42 reference statements)

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“…The ultraviolet-visible (UV-vis) absorption properties of the as-prepared plasmonic Ag@SiO 2 core-shell NPs ( Figures S5 and S6, Supporting Information) indicated that the LSPR peak of the Ag@ SiO 2 NPs was centered at around 430 nm, which was originated from the surface plasmon oscillations of the Ag NPs. [ 38,39 ] The LSPR absorption spectra of the plasmonic nanostructures and g-C 3 N 4 are well overlapped ( Figure S7, Supporting Information), thus the Ag LSPR-induced oscillating electric fi eld could effi ciently transfer suffi cient energy to the nearby g-C 3 N 4 to overcome its band gap, allowing for the PRET process in these plasmon-modifi ed g-C 3 N 4 photocatalysts. [31][32][33] As photoluminescence (PL) emission originates from the radiative recombination of charge carriers in the semiconductors, PL emission spectra were recorded to investigate the behavior of the photogenerated charge carriers in these g-C 3 N 4 / Ag@SiO 2 photocatalysts.…”

Section: Resultsmentioning

confidence: 99%

Nanogap Engineered Plasmon‐Enhancement in Photocatalytic Solar Hydrogen Conversion

Chen

Dong

et al. 2015

Adv Materials Inter

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of pure g-C 3 N 4 for hydrogen production was relatively low, although the band gap ( E g ≈ 2.7 eV) and band positions of g-C 3 N 4 match well with the intrinsic requisites for photocatalytic water splitting under visible light. [ 6,8 ] To this end, previous attempts have been mainly focused on improving charge carrier migration and separation in g-C 3 N 4 via three aspects: (1) constructing band structure aligned heterojunctions between g-C 3 N 4 and other semiconductor photocatalysts (Cu 2 O, [ 10 ] N-CeO x , [ 11 ] ZnFe 2 O 4 , [ 12 ] CNS, [ 13 ] etc.) for effi cient charge separation, (2) combining g-C 3 N 4 with conductive materials (graphene, [ 14 ] CNTs, [ 15 ] etc.), and (3) designing unique nanostructures (nanorods, [ 16,17 ] nanosheets, [ 18,19 ] mesoporous nanostructures, [20][21][22] etc.) for fast charge carrier migration. However, the photocatalytic effi ciencies of these modifi ed g-C 3 N 4 were still not high enough for practical applications in effi cient solar energy conversion systems.It has been well established that the mismatch between the relatively long penetration depth of photons and the short mean free path of charge carriers signifi cantly account for the high-rate recombination of electrons and holes in semiconductors. [ 23,24 ] Therefore, the charge carrier recombination could be effectively inhibited if the travel distance for charge carriers to transfer to the surface active sites is minimized. Recent development of photocatalysts modifi ed with plasmonic nanostructures of noble metals (such as Au, [25][26][27][28] Ag, [ 29,30 ] etc.) offered a new opportunity to fulfi ll this strategy. These metal nanoparticles (NPs) characteristic of the localized surface plasmon resonance (LSPR) effect can act as nanoantennas for light trapping and form a locally enhanced electromagnetic fi eld in the proximity of the metal NPs. Under irradiation, especially when the LSPR absorption of the metal NPs is partially overlapped with the optical absorption of the semiconductor, [31][32][33] the LSPR induced plasmon resonance energy transfer (PRET) from the plasmonic metal to the nearby semiconductor will preferentially excite charge carriers in the metal/semiconductor interface, namely, the near-surface region of the semiconductor. Then the transfer distance of the photoexcited charge carriers to the surface reactive sites for photocatalytic reactions would be shortened. Watanabe and co-workers demonstrated that the enhanced photocatalytic activity over Ag NPs incorporated TiO 2 photocatalyst was achieved by the LSPR induced electromagnetic fi eld amplitude of Ag NPs. [ 34 ] The consequent PRET effect favored the charge carrier formation in the near-surface region of TiO 2 , thus the

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Section: Resultsmentioning

confidence: 99%

Nanogap Engineered Plasmon‐Enhancement in Photocatalytic Solar Hydrogen Conversion

Chen

Dong

et al. 2015

Adv Materials Inter

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“…Ag@SiO 2 core/shell nanoparticles have garnered intense interest due to their optical, electrical and chemical properties that have enabled applications in diverse areas such as catalysis [1], surfaceenhanced Raman scattering (SERS) imaging and sensing [2][3][4][5], and drug delivery [6]. The silica shell is chemically inert, and optically transparent, which further renders surface functionality, reactivity and stability the nanocomposites.…”

Section: Introductionmentioning

confidence: 99%

Ammonia-free preparation of Ag@SiO 2 core/shell nanoparticles

Jia

et al. 2015

Applied Surface Science

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“…12 They are potentially used in various elds including antibacterial, anticorrosion and environmental applications. 13,14 Several studies have highlighted the anti-fungal, antiviral and antifouling activities of Ag NPs. 15,16 As a noble metal, Ag NPs have been widely used as an effective antimicrobial agent against bacteria, fungi, and viruses.…”

Section: 10mentioning

confidence: 99%

Silicone/Ag@SiO₂core–shell nanocomposite as a self-cleaning antifouling coating material

et al. 2018

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The effects of Ag@SiO 2 core-shell nanofiller dispersion and micro-nano binary structure on the selfcleaning and fouling release (FR) in the modelled silicone nano-paints were studied. An ultrahydrophobic polydimethylsiloxane/Ag@SiO 2 core-shell nanocomposite was prepared as an antifouling coating material. Ag@SiO 2 core-shell nanospheres with 60 nm average size and a preferential {111} growth direction were prepared via a facile solvothermal and a modified Stöber methods with a controlled shell thickness. Ag@SiO 2 core-shell nanofillers were inserted in the silicone composite surface via solution casting technique. A simple hydrosilation curing mechanism was used to cure the surface coating.Different concentrations of nanofillers were incorporated in the PDMS matrix for studying the structureproperty relationship. Water contact angle (WCA) and surface free energy determinations as well as atomic force microscopy and scanning electron microscope were used to investigate the surface selfcleaning properties of the nanocomposites. Mechanical and physical properties were assessed as durability parameters. A comparable study was carried out between silicone/spherical Ag@SiO 2 coreshell nanocomposites and other commercial FR coatings. Selected micro-foulants were used for biological and antifouling assessments up to 28 days. Well-distributed Ag@SiO 2 core-shell (0.5 wt%) exhibited the preferable self-cleaning with WCA of 156 and surface free energy of 11.15 mN m À1.

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Ag@SiO₂ Core–Shell Nanostructures: Distance-Dependent Plasmon Coupling and SERS Investigation

Cited by 182 publications

References 35 publications

Nanogap Engineered Plasmon‐Enhancement in Photocatalytic Solar Hydrogen Conversion

Nanogap Engineered Plasmon‐Enhancement in Photocatalytic Solar Hydrogen Conversion

Ammonia-free preparation of Ag@SiO 2 core/shell nanoparticles

Silicone/Ag@SiO₂core–shell nanocomposite as a self-cleaning antifouling coating material

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Ag@SiO2 Core–Shell Nanostructures: Distance-Dependent Plasmon Coupling and SERS Investigation

Cited by 182 publications

References 35 publications

Nanogap Engineered Plasmon‐Enhancement in Photocatalytic Solar Hydrogen Conversion

Nanogap Engineered Plasmon‐Enhancement in Photocatalytic Solar Hydrogen Conversion

Ammonia-free preparation of Ag@SiO 2 core/shell nanoparticles

Silicone/Ag@SiO2core–shell nanocomposite as a self-cleaning antifouling coating material

Contact Info

Product

Resources

About

Ag@SiO₂ Core–Shell Nanostructures: Distance-Dependent Plasmon Coupling and SERS Investigation

Silicone/Ag@SiO₂core–shell nanocomposite as a self-cleaning antifouling coating material