Electrooptical Synergy on Plasmon–Exciton‐Codriven Surface Reduction Reactions

Cao, En; Guo, Xiao; Zhang, Liqiang; Shi, Ying; Lin, Weihua; Liu, Xiaochun; Fang, Yurui; Zhou, Li; Sun, Yinghui; Song, Yuzhi; Liang, Wenjie; Sun, Mengtao

doi:10.1002/admi.201700869

Cited by 95 publications

(51 citation statements)

References 36 publications

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“…X‐ray photoelectron spectroscopy instrument (XPS), a technique used to analyze the chemical composition of a sample surface, can be used to demonstrate that the proposed 3D flexible AgNPs@MoS 2 /pyramidal polymer has been successfully fabricated. As shown in the inset in Figure e, the Mo 3d and Ag 3d regions in the XPS spectrum present two typical characteristic peaks at ≈229 and ≈232 eV assigned to Mo 4+ 3d 5/2 and Mo 4+ 3d 3/2 , respectively, and peaks at ≈371 and ≈374 eV, which are assigned to Ag 3d and Ag 3d 3 , respectively . In addition, the C 1s and O 1s at ≈284 and 532 eV, respectively, are assigned to the polymer .…”

Section: Resultsmentioning

confidence: 89%

Constructing 3D and Flexible Plasmonic Structure for High‐Performance SERS Application

et al. 2018

Adv Materials Technologies

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provide more hot spots, which are introduced by the electromagnetic mechanism (EM). By the virtue of their larger specific surface area and periodic structure, 3D SERS substrates can effectively amplify the optical field around metal nanoparticles (NPs), thereby enhancing the Raman signal. Moreover, the 3D structure of these substrates is beneficial for the enrichment of probe molecules around metal nanoparticles; as a result, one can still obtain a high Raman signal, even under an ultralow concentration. Consequently, an increasing number of researchers are now focusing on the design and fabrication of 3D SERS substrates.To make full use of the merits of the 3D structure, SERS substrates based on 2D materials and metal nanoparticles have been combined and proposed. [23,24] In these 3D SERS substrates, the 3D structure can fully utilize the 3D focal volume of the incident beam and increase the density of the metal nanoparticles. Furthermore, introduction of the 2D material can act as an atomically thick SERS substrate, [25] perfect absorbent layer of molecules, [26] excellent sub-nanometer spacer, [27] and passivation layer for metal, [28,29] and introduce enhancements via a chemical mechanism (CM). Previously, a 3D SERS substrate based on graphene covering a pyramid-shaped Au structure was reported to achieve high enhancement. [30] While the integration of graphene and pyramid-shaped Au was successfully implemented, this 3D SERS substrate was not flexible and did not meet with the requirements when detecting probe molecules on an arbitrary curvilinear surface.Therefore, transformation of these stiff 3D substrates into flexible structures via using various methods has been investigated extensively. Leem et al. reported 3D crumpled graphene-AuNPs hybrid structures for SERS applications using a mechanical self-assembly strategy on a thermally activated polymer. [31] Similarly, Lee et al. fabricated a rippled graphene structure on a polystyrene substrate using a thermal rippling process and demonstrated the increased plasmonic coupling and higher density of the hot spots on the rippled nanostructure. [32] Kumar et al. presented a flexible SERS sensor by depositing Ag on structured polydimethylsiloxane using a Taro leaf as the template and achieved highly sensitive detection for malachite green. [33] Moreover, to fabricate a flexible 3D SERS substrate, the transfer printing technique, [34] shadow Substrate design has attracted much interest in development of an effective surface enhanced Raman scattering (SERS) sensor. A flexible SERS substrate with excellent performance needs to be sensitive to details of the preparation process; this sensitivity represents a significant challenge for practical applications as opposed to laboratory research applications. Here, a 3D flexible plasmonic structure, AgNPs@MoS 2 /pyramidal polymer (polymethyl methacrylate), is fabricated using a simple and lowcost method. Using experiments and theoretical simulations, the SERS performance of the proposed substrate is assessed in terms of ...

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Section: Resultsmentioning

confidence: 89%

Constructing 3D and Flexible Plasmonic Structure for High‐Performance SERS Application

et al. 2018

Adv Materials Technologies

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“…First, graphene is sensitive to the external environment and always P‐doped in ambient air. In addition, the residue during the transfer process and the introduction of oxygen plasma during the etching step will affect the P‐doping concentration of graphene and shift the Dirac point to a more positive position . As a result, the required back gate voltage, which is typically greater than 20 V, for tuning holes to electrons exceeds the maximum output voltage (typically 3.3 V) of current readout integrated circuit (ROIC) technologies .…”

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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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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“…[32] In FDTD approach, electric and magnetic fields are calculated alternately step by step at sequenced time and space segments. [32] In FDTD approach, electric and magnetic fields are calculated alternately step by step at sequenced time and space segments.…”

Section: Sers Performance Of 3d Forest-like Ag Nanodendrite Structurementioning

confidence: 99%

Superhydrophobic 3D Forest‐Like Ag Microball/Nanodendrite Hierarchical Structure as SERS Sensor for Rapid Droplets Detection

Gao

You

Yang

et al. 2019

Adv Materials Inter

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are dedicated to find a facile and easy way preparing the 3D nanostructures with outstanding SERS performance. [17,18] Electrochemical deposition approach was commonly used for fabrication of nanostructures to obtain high catalytic effectiveness on electrodes. [19,20] It has been considered as a rapid and low-cost method for synthesizing SERS substrates in recent years. [21,22] Morphology of the substrates can be easily controlled by adjusting the voltage, constant and concentration of the analyte, greatly improving the preparing efficiency.Surface superhydrophobicity have drawn much attention in various fields for its self-cleaning and recyclable properties. [23] The surface micro/nanostructures and surface low energy modification are both needed for generating superhydrophobicity. [24] Studies on preparing SERS substrates with superhydrophobicity have been explored gradually, normally utilizing aggregation of the probe molecule droplets to enhance the detection limit. [25][26][27] However, directly using the self-cleaning property can offer more advantages for practical application of the substrate. Shin et al. prepared a novel SERS sensor with low adhesive property to detect the droplets rapidly for real-time chemical and biological monitoring. [28] Traditional SERS detection is usually proceeded by drying the probe molecule solution on substrates for contacting with the noble metal nanostructures, which needs several hours' immersing time. [29,30] If sample droplets can be tested directly on the substrate, it will greatly improve the testing efficiency and be available in practical application.We designed a 3D Ag forest-like micro/nanostructure by electrochemical deposition of Ag nanodendrites on the Ag microwool ball structures, acting as an upholder for the nanodendrites vertically growing. The deposition process was facile and needed only several minutes to generate the structures. Superior SERS performance of the substrate was verified by comparing different morphologies with Ag nanodendrites or microball structures growing on film and electromagnetic field distribution simulation. The superiority was caused by the standing nanotips on the dendrites and nanogaps among the standing Ag nanodendrites. Superhydrophobicity was induced to the substrate for the purpose of rapid detecting. Directly SERS detections on sample droplets were tested with detection Real environment detection application by surface-enhanced Raman scattering (SERS) requires substrates with high sensitivity, rapid detection, and low cost. In this study, a rapid SERS detection of liquid droplets sample by a superhydrophobic 3D forest-like Ag microball/nanodendrite hierarchical structure is reported. Easy preparation is provided by electrochemical deposition method, developing a Ag forest-like hierarchical nanostructure. The vertically standing nanodendrites offer more amounts of SERS "hot spots" for enhancing the Raman signals. At the same time, the micro/nanostructures supply suitable condition for superhydrophobicity by low surface energ...

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Electrooptical Synergy on Plasmon–Exciton‐Codriven Surface Reduction Reactions

Cited by 95 publications

References 36 publications

Constructing 3D and Flexible Plasmonic Structure for High‐Performance SERS Application

Constructing 3D and Flexible Plasmonic Structure for High‐Performance SERS Application

Ambipolar Graphene–Quantum Dot Phototransistors with CMOS Compatibility

Superhydrophobic 3D Forest‐Like Ag Microball/Nanodendrite Hierarchical Structure as SERS Sensor for Rapid Droplets Detection

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