Aluminum Plasmonics for Enhanced Visible Light Absorption and High Efficiency Water Splitting in Core–Multishell Nanowire Photoelectrodes with Ultrathin Hematite Shells

Ramadurgam, Sarath; Lin, Tzu-ging; Yang, Chen

doi:10.1021/nl501541s

Cited by 70 publications

(70 citation statements)

References 43 publications

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“…While plasmonic nanosensors are almost exclusively made of gold or silver, LSPR sensing applications of other metal and/or metal oxide nanocomposites, e.g., zinc oxide [78][79][80], aluminium [81][82][83][84][85][86][87] and copper [88][89][90][91][92][93][94][95][96], have also been investigated. However, the non-noble metals are susceptible to corrosion in aqueous environments and oxidation in air, both of which significantly diminish refractive index sensitivity [4].…”

Section: Effect Of Nanoparticle Composition Size and Shape On Plasmomentioning

confidence: 99%

Strategies for enhancing the sensitivity of plasmonic nanosensors

et al. 2015

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Based on the localized surface plasmon resonance (LSPR) of metallic nanoparticles, plasmonic nanosensors have emerged as a powerful tool for biosensing applications. Many detection schemes have been developed and the field is rapidly growing to incorporate new methodologies and applications. Amidst all the ongoing research efforts, one common factor remains a key driving force: continued improvement of high-sensitivity detection. Although there are many excellent reviews available that describe the general progress of LSPR-based plasmonic biosensors, there has been limited attention to strategies for improving the sensitivity of plasmonic nanosensors. Recognizing the importance of this subject, this review highlights recent progress on different strategies used for improving the sensitivity of plasmonic nanosensors. These strategies are classified into the following three categories based on their different sensing mechanisms: (1) sensing based on target-induced local refractive index changes, (2) colorimetric sensing based on LSPR coupling, and (3) amplification of detection sensitivity based on nanoparticle growth. The basic principles and cutting-edge examples are provided for each kind of strategy, collectively forming a unifying framework to view the latest attempts to improve the sensitivity of nanoplasmonic sensors. Future trends for the fabrication of improved plasmonic nanosensors are also discussed.

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Section: Effect Of Nanoparticle Composition Size and Shape On Plasmomentioning

confidence: 99%

Strategies for enhancing the sensitivity of plasmonic nanosensors

et al. 2015

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“…The absorption efficiency within the core and shells of CMS NWs can be individually computed from the ratio of the absorbed power to the incident power as follows [32,33] :…”

Section: Absorption Efficiency Of Single Nwsmentioning

confidence: 99%

“…Alternatively, "poor" plasmonic materials such as aluminum and copper, can be utilized in metal-photocatalyst CS and semiconductor-metal-photocatalyst CMS NWs to effectively enhance absorption in ultrathin photocatalyst layers [33,34] . Using hematite as the photoanode, copper(I) oxide as the photocathode and silicon as the scaffold, plasmonic photoelectrodes can be fabricated as shown in Fig.…”

Section: Plasmon Enhanced Light Harvesting In Nanowire Photoelectrodesmentioning

confidence: 99%

“…It is critical to note that the absorption predicted in Refs. [33,34] is valid only for single NWs and does not quantitatively translate to the performance of a large area device directly. However, an array of such optimized CS and CMS absorbers is expected to provide a substantial enhancement in the absorption leading to an overall improvement in the STH efficiency.…”

Section: Plasmon Enhanced Light Harvesting In Nanowire Photoelectrodesmentioning

confidence: 99%

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Tailoring Optical and Plasmon Resonances in Core-shell and Core-multishell Nanowires for Visible Range Negative Refraction and Plasmonic Light Harvesting: A Review

Ramadurgam

Lin

Yang

2015

Journal of Materials Science & Technology

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Semiconductor nanowires (NWs) are sub-wavelength structures which exhibit strong optical (Mie) resonances in the visible range. In addition to such optical resonances, the localized surface plasmon resonances (LSPRs) in metal-semiconductor core-shell (CS) and core-multishell (CMS) NWs can be tailored to achieve novel negative-index metamaterials (NIM), extreme absorbers, invisibility cloaks and sensors. Particularly, in this review, we focus on our recent theoretical studies which highlight the versatility of CS and CMS NWs for: 1) the design of negative-index metamaterials in the visible range and 2) plasmonic light harvesting in ultrathin photocatalyst layers for water splitting. Utilizing the LSPR in the metal layer and the magnetic dipole (Mie) resonance in the semiconductor shell under transverse electric (TE) polarization, semiconductor-metal-semiconductor CMS NWs can be designed to exhibit spectrally overlapping electric and magnetic resonances in the visible range. NWs exhibiting such double resonances can be considered as meta-atoms and arrayed to form polarization dependent, low-loss NIM. Alternatively, by tuning the LSPR in the TE polarization and the optical resonance in the transverse magnetic (TM) polarization of metal-photocatalyst CS and semiconductor-metal-photocatalyst CMS NWs, the absorption within ultrathin (sub-50 nm) photocatalyst layers can be substantially enhanced. Notably, aluminum and copper based NWs provide absorption enhancement remarkably close to silver and gold based NWs, respectively. Further, such absorption is polarization independent and remains high over a large range of incidence angles and permittivity of the medium. Therefore, due to the tunability of their optical properties, CS and CMS NWs are expected to be vital components for the design of nanophotonic devices.

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“…[1][2][3] Through solar water splitting at the photocatalyst or photoanode,g enerated hydrogen gas or photocurrent can be stored for photoelectrochemical (PEC) cells,r espectively. To increase the efficiency of the solar water splitting cell, al ot of research has been dedicated to examine suitable materialss uch as Cu 2 O, [4] Fe 2 O 3 , [5][6][7] TiO 2 , [8,9] WO 3 , [10] ZnO, [11,12] and other metal oxides. [3] Hematite (a-Fe 2 O 3 )i saf avorable photoanodem aterial for solar water splitting because of its high stability under ambient conditions,n ontoxicity,e arth-abundance,a nd moderate band gap (1.9-2.2 eV).…”

Section: Introductionmentioning

confidence: 99%

Photoreduction Synthesis of Hierarchical Hematite/Silver Nanostructures for Photoelectrochemical Water Splitting

et al. 2015

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Hematite is a good candidate for solar water splitting because of its earth‐abundance, moderate band gap, and electrochemical stability. However, the improper energy band position to absorb the visible region of sunlight has limited any increase of the efficiency. In this study, a facile solution‐based photoreduction process is employed to fabricate a hematite/silver hierarchical nanostructure. By irradiating hydrothermally grown hematite nanowire with UV light, Ag nanoparticles are synthesized rapidly on the surface of the hematite nanowire, the size of which is easily controllable by changing the UV irradiation time. The enhanced optical performance of the resultant hierarchical nanostructure is confirmed by various analytical tools that include UV/Vis absorption, photoluminescence, and Raman spectroscopy together with the theoretical estimation through finite‐difference time‐domain simulation. Furthermore, the hierarchical hematite/silver nanostructure is applied as a photoanode in a photo‐electrochemical cell for water splitting with enhanced efficiency.

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Aluminum Plasmonics for Enhanced Visible Light Absorption and High Efficiency Water Splitting in Core–Multishell Nanowire Photoelectrodes with Ultrathin Hematite Shells

Cited by 70 publications

References 43 publications

Strategies for enhancing the sensitivity of plasmonic nanosensors

Strategies for enhancing the sensitivity of plasmonic nanosensors

Tailoring Optical and Plasmon Resonances in Core-shell and Core-multishell Nanowires for Visible Range Negative Refraction and Plasmonic Light Harvesting: A Review

Photoreduction Synthesis of Hierarchical Hematite/Silver Nanostructures for Photoelectrochemical Water Splitting

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