Electrically enhanced hot hole driven oxidation catalysis at the interface of a plasmon–exciton hybrid

Lin, Weihua; Cao, En; Zhang, Liqiang; Xu, Xuefeng; Song, Yuzhi; Liang, Wenjie; Sun, Mengtao

doi:10.1039/c7nr08878g

Cited by 110 publications

(93 citation statements)

References 35 publications

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“…Graphene is the carrier transport channel, and PbS CQDs are used as the photon absorbing material ( Figure a). The unique electronic properties of graphene offer a gate‐tuneable carrier density and polarity that enable us to tune the sensitivity and operation speed of the detector . Figure b shows the photocurrent response of the decorated phototransistor under illumination at room temperature in ambient, which is measured with a focused laser beam with a wavelength of 1550 nm.…”

Section: Resultsmentioning

confidence: 99%

“…0D materials such as IV–VI group quantum dots show excellent light harvesting capability in the infrared region and can be conveniently integrated with silicon substrates via a solution process . Recently, hybrid graphene‐CQD phototransistors which combine the high mobility of graphene and strongly light‐absorbing absorbance of CQDs have been explored for enhancing both the photo‐responsivity and the gain of the photodetector and the detected wavelength can extend into the shortwave infrared (SWIR) region (≈1550 nm) . Photo‐generated charges in CQDs can transfer to graphene, while oppositely charged carriers remain trapped in the quantum‐dot layer.…”

Section: Introductionmentioning

confidence: 99%

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Ambipolar Graphene–Quantum Dot Phototransistors with CMOS Compatibility

Zheng

Zhou

Ning

et al. 2018

Advanced Optical Materials

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The hybridization of 2D materials and colloidal quantum dots (CQDs) has been demonstrated to be an ideal platform for infrared photodetectors due to the high mobility of 2D materials and the excellent light harvesting capability of CQDs. However, the realization of ambipolar, broadband, and room‐temperature graphene–quantum dot phototransistors with complementary metal–oxide–semiconductor (CMOS) compatibility remains challenging. Here N, S codecorated graphene is deposited with PbS CQDs to fabricate a hybrid phototransistor on a silicon dioxide/silicon gate. The resulting device demonstrates a gate‐tuneable ambipolar feature with a low gate bias of less than 3.3 V at room temperature in ambient. Broadband spectra from visible to near‐infrared and to short wave infrared (SWIR) light can be detected with gain value of up to 105 and a fast response of 3 ms. Upon illumination by SWIR light at 1550 nm, the phototransistor exhibits an ultrahigh responsivity that is on the order of 104 AW−1 and a specific detectivity that is on the order of 1012 Jones with a low driving voltage of 1 V. This decorated hybrid architecture illustrates the potential of graphene and CQDs to be integrated with silicon integrated circuits and opens a new path toward ambipolar photodetector fabrication.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Ambipolar Graphene–Quantum Dot Phototransistors with CMOS Compatibility

Zheng

Zhou

Ning

et al. 2018

Advanced Optical Materials

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“…Regarding transformations involving charge transfer of LSPR‐excited hot electrons and holes to surface adsorbates, a unifying treatment has been recently proposed . In this case, it has been shown that hot electrons can participate in LSPR‐driven reduction reactions and the holes can assist LSPR‐driven oxidations ,. While Ag, Au, Cu, and Al based NPs have attracted attention as catalysts,,,, only few studies have focused on the establishment of proper structure‐performance relationships.…”

Section: Introductionmentioning

confidence: 99%

Addressing the Effects of Size‐dependent Absorption, Scattering, and Near‐field Enhancements in Plasmonic Catalysis

et al. 2018

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Studies on surface plasmon resonance (LSPR) mediated catalytic transformations have focused on quantification of reaction rates and investigation on enhancement mechanisms. However, the establishment of structure-performance relationships remains limited. For instance, the importance of nanoparticle size remains overlooked, and relatively large nanoparticles (> 50 nm in size) are generally employed as catalysts. Herein, we unravel how plasmon decay pathways (absorption and scattering efficiencies) and electric field enhancements as a function of size dictate plasmonic catalytic performances. We employed Ag NPs having 12-50 nm in size as a proof-of-concept catalysts, and the LSPR-mediated oxidation of p-aminothiophenol to p,p'-dimercaptoazobenzene as a model reaction. Our data and simulations revealed that the LSPR-mediated activities displayed a volcano-type variation with size, which was dependent on the balance among near field enhancements, absorption, and scattering. As this transformation is driven by the chargetransfer of LSPR-excited hot-electrons to adsorbed O 2 molecules, the variations in the optical absorption as a function of size represented the dominant contribution to the plasmonic catalytic activities. We believe our results shed important insights over the optimization of physical and chemical parameters in plasmonic nanoparticles in order to maximize plasmonic catalytic activities.

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“…This conclusion is powerful evidence for the interpretation of the disappearance of IR-active modes in SERS. In previous SERS experiments, dimerization of p-aminothiophenol (PATP) to DMAB was an ideal candidate for revealing plasmon-driven catalytic reactions [16,[70][71][72][73][74][75][76]. Both theoretical simulations and experimental observations have been investigated in detail, while the dynamic process of the dimerization needs further investigation [77][78][79][80].…”

Section: Au Ters For Plasmon-driven Synthesis Catalysismentioning

confidence: 99%

Au Tip-Enhanced Raman Spectroscopy for Catalysis

Wang

Qiao

2018

Applied Sciences

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Plasmon-driven chemical reactions have been a prospective field for surface plasmon resonance and tip-enhanced Raman scattering. In this review, the principles of tip-enhanced Raman spectroscopy (TERS) are first introduced. Following this, the use of Au TERS for plasmon-driven synthesis catalysis is introduced. Finally, the use of Au TERS for catalysis of dissociation reactions is discussed. This review can provide a deeper understanding of Au TERS for plasmon-driven catalysis.

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Electrically enhanced hot hole driven oxidation catalysis at the interface of a plasmon–exciton hybrid

Cited by 110 publications

References 35 publications

Ambipolar Graphene–Quantum Dot Phototransistors with CMOS Compatibility

Ambipolar Graphene–Quantum Dot Phototransistors with CMOS Compatibility

Addressing the Effects of Size‐dependent Absorption, Scattering, and Near‐field Enhancements in Plasmonic Catalysis

Au Tip-Enhanced Raman Spectroscopy for Catalysis

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