Ultrahigh density plasmonic hot spots with ultrahigh electromagnetic field for improved photocatalytic activities

Yang, Tung‐Han; Harn, Yeu‐Wei; Pan, Mingyang; Huang, Li-De; Chen, Miao-Chun; Li, Ben-Yuan; Liu, Pei-Hsuan; Chen, Po‐Yen; Lin, Chun‐Cheng; Wei, Pei‐Kuen; Chen, Lih‐Juann; Wu, Jenn‐Ming

doi:10.1016/j.apcatb.2015.08.014

Cited by 23 publications

(8 citation statements)

References 65 publications

(35 reference statements)

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“…Typically, the LSPR-induced charge separation at the interface between the Au NPs and TiO 2 can occur by transferring the energy contained in the oscillating electrons or local plasmonic field from Au NPs to TiO 2 through direct electron transfer, also known as hot electron injection 47 48 . Higher electromagnetic field generates more hot electron 49 50 . In order to verify our assumption, the design of TiO 2 ARHN is helpful to improve electromagnetic field as compared to NWs, the PEC measurement was performed to check the hot electron effect.…”

Section: Resultsmentioning

confidence: 99%

Plasmon-Enhanced Photocurrent using Gold Nanoparticles on a Three-Dimensional TiO2 Nanowire-Web Electrode

Yen

Chen

et al. 2017

Sci Rep

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In this study, an anatase/rutile mixed-phase titanium dioxide (TiO2) hierarchical network deposited with Au nanoparticles (Au/TiO2 ARHN) was synthesized using a facile hydrothermal method followed by a simple calcination step. Such a unique structure was designed for improving the light harvest, charge transportation/separation, and the performance of photo-electro-chemical (PEC) cells. The properties of the as-synthesized Au/TiO2 ARHN in PEC cells were investigated by electrochemical measurements using a three-electrode system in a 1 M NaOH electrolyte. Remarkably, a 4.5-folds enhancement of the photocurrent for Au/TiO2 ARHN was observed as compared to that for TiO2 nanowire (NW), under AM1.5G solar illumination, suggesting its potential application in PEC cells. A mechanism has been proposed to explain the high photocurrent of Au/TiO2 ARHN in PEC water splitting.

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Section: Resultsmentioning

confidence: 99%

Plasmon-Enhanced Photocurrent using Gold Nanoparticles on a Three-Dimensional TiO2 Nanowire-Web Electrode

Yen

Chen

et al. 2017

Sci Rep

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“…Depositing gold nanoparticles (Au NPs) onto the ZnO nanostructures is an efficient strategy that can further increase the light absorption capacity of ZnO photoactive materials and the corresponding charge carrier density due to surface plasmon resonance efficiency. 23−26 To date, the diversity of particular hybrid structures between ZnO and gold has been investigated, for example, nanosheets, 24 nanorods, 26 hollow spheres, 27 core− shell nanostructures, 28 and nanotube arrays. 29 Relative to one/ two-dimensional counterparts, three-dimensional (3D) ZnO nanostructures have drawn more attention since they exhibit a large specific surface area and favorable electron transport.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Unfortunately, the wide band gap for ZnO nanostructures at a voltage of 3.3 eV limits its ability to absorb visible and infrared light, restricting its further utilization in PEC sensors. Depositing gold nanoparticles (Au NPs) onto the ZnO nanostructures is an efficient strategy that can further increase the light absorption capacity of ZnO photoactive materials and the corresponding charge carrier density due to surface plasmon resonance efficiency. − To date, the diversity of particular hybrid structures between ZnO and gold has been investigated, for example, nanosheets, nanorods, hollow spheres, core–shell nanostructures, and nanotube arrays . Relative to one/two-dimensional counterparts, three-dimensional (3D) ZnO nanostructures have drawn more attention since they exhibit a large specific surface area and favorable electron transport. − Among various 3D ZnO nanostructures, the simple and template-free synthesis of ZnO nanoflower-like composites without introducing any toxic substances or expensive surfactants exhibits good application potentials .…”

Section: Introductionmentioning

confidence: 99%

Au Nanoparticle-Decorated ZnO Microflower-Based Immunoassay for Photoelectrochemical Detection of Human Prostate-Specific Antigen

Gong

et al. 2021

ACS Appl. Nano Mater.

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Herein, an in situ amplified photoelectrochemical (PEC) immunoassay with ZnO microflowers (ZnO MFs) decorated with gold nanoparticles (Au NPs) was developed to determine human prostate-specific antigen (PSA) using L-cysteineloaded liposomes for signal amplification. Initially, ZnO MFs with smooth and well-defined morphology were synthesized under hydrothermal conditions. The heterostructured microflowers were formed by depositing Au NPs on ZnO microflowers using trisodium citrate. L-Cysteine (L-Cys)-encapsulated liposomes conjugated with detection antibodies were used to fabricate a sandwiched immunocomplex on a capture antibody-modified microtiter plate in the presence of target PSA. The liposomes were lysed using Triton X-100 to release the encapsulated L-Cys, thereby increasing the photocurrent on Au NP-decorated ZnO MFs. Results indicated that the photoelectrochemical immunoassay displayed good photocurrents to response PSA concentrations from 0.01 to 20 ng mL −1 , and the detection PSA concentration was as low as 0.79 pg mL −1 . Furthermore, the photoelectrochemical immunoassay had good precision, high selectivity, and well-matched accuracy toward target PSA in human serum specimens using the commercialized human PSA ELISA kit as a reference.

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“…Previously, Ag colloid systems with the hot spots causing SERS spectra were shown to possess double LSPR peaks in the extinction spectra. , This interesting phenomenon can be explained by a plasmon hybridization model for nanoparticle dimers analogous to the molecular orbital theory for diatomic molecules . So far, much endeavor has been devoted to the preparation of substrates for surface-enhanced spectroscopy − and plasmonic photocatalysts with the optical hot spots. − While the presence of hot spots is suggested by the theoretical simulations or SERS spectra, the study on the solid-state system providing direct optical evidence is only limited . Thus, a convenient technique for generating LSPR coupling-induced hot spots is highly required with the solid evidence.…”

Section: Introductionmentioning

confidence: 99%

Optical Hot Spot Generation by the Plasmonic Coupling of Au Nanoparticles in the Nanospaces of Mesoporous Titanium(IV) Oxide

2021

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An in situ reduction technique consisting of chemisorption of 1,3,5,7-tetramethylcyclotetrasiloxane (TMCTS) and subsequent reaction with HAuCl 4 has been developed for depositing Au nanoparticles (NPs) uniformly in the depth direction of a mesoporous TiO 2 nanocrystalline film (Au/TMCTS/mp-TiO 2 ). The TMCTS monolayer is further converted into silicon oxide by heating in the air (Au/SiO x /mp-TiO 2 ). In the absorption spectra of Au/SiO x /mp-TiO 2 prepared at varying HAuCl 4 concentrations (C), the localized surface plasmon resonance (LSPR) band of Au NPs significantly broadens C ≈ 1.22 mM at 546 nm to be split into two peaks around 500 and 700 nm at C ≥ 2.43 mM, whereas such a phenomenon is not observed for the usual Au NP-loaded TiO 2 particles. Three-dimensional-finite difference time domain simulations showed that the unique optical property of Au/SiO x /mp-TiO 2 stems from the effective LSPR coupling of very close Au NPs and partial fusions in the nanospaces of mp-TiO 2 . Further, the optical hot spots in Au/TMCTS/mp-TiO 2 as well as Au/SiO x /mp-TiO 2 generate an intense local electric field giving increase to a great enhancement of the absorption in the infrared spectrum of the TMCTS monolayer on mp-TiO 2 .

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Ultrahigh density plasmonic hot spots with ultrahigh electromagnetic field for improved photocatalytic activities

Cited by 23 publications

References 65 publications

Plasmon-Enhanced Photocurrent using Gold Nanoparticles on a Three-Dimensional TiO2 Nanowire-Web Electrode

Plasmon-Enhanced Photocurrent using Gold Nanoparticles on a Three-Dimensional TiO2 Nanowire-Web Electrode

Au Nanoparticle-Decorated ZnO Microflower-Based Immunoassay for Photoelectrochemical Detection of Human Prostate-Specific Antigen

Optical Hot Spot Generation by the Plasmonic Coupling of Au Nanoparticles in the Nanospaces of Mesoporous Titanium(IV) Oxide

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