Ion-modulated nonlinear electronic transport in carbon nanotube bundle/RbAg4I5 thin film composite nanostructures

Sun, Jia‐Lin; Zhang, Wei; Wei, Jin; Gu, B. F.

doi:10.1063/1.4861728

Cited by 7 publications

(4 citation statements)

References 35 publications

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“…According to the IEBS model, ,− f is defined as the percentage of electrons dissociated from the IEBSs under illumination. For the general case, f satisfies the following formula where β and γ are the rate of dissociation and recombination of IEBSs, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…In recent years, we have performed research on the preparation and characterization of composites made from low-dimensional nanomaterials and the solid ultrafast ion conductor RbAg 4 I 5 , ,− which provides a new idea for high-performance optoelectronic devices. Since its discovery in the 1960s, RbAg 4 I 5 has aroused widespread interest.…”

Section: Introductionmentioning

confidence: 99%

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High-Responsivity Photodetector Based on a Suspended Monolayer Graphene/RbAg₄I₅ Composite Nanostructure

Wang

Yin

et al. 2020

ACS Appl. Mater. Interfaces

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Graphene has excellent electrical, optical, thermal, and mechanical properties that make it an ideal optoelectronic material. However, it still has some problems, such as a very low light absorption rate, which means it cannot meet the application requirements of high-performance optoelectronic devices. Here, we produce a high-responsivity photodetector based on a monolayer graphene/RbAg4I5 composite nanostructure. With the aid of poly(methyl methacrylate), we suspend the monolayer graphene on a hollow carving groove with a width of 100 μm. A RbAg4I5 film evaporated on the back of the graphene causes the composite nanostructure to generate a large photocurrent under periodic illumination. Experimental results show that the dissociation and recombination of ion–electron bound states (IEBSs) are responsible for the excellent photoresponse. The device has very high (>1 A W–1) responsivity in wide-band illumination wavelength from 375 nm to 808 nm, especially at 375 nm, where it shows a responsivity of up to ∼5000 A W–1. We designed the dimensions of the carving groove to allow the light spot to cover the entire groove, and we cut the graphene sheet to match the length of the carving groove. With the structural optimizations, the energy of light can be used more efficiently to dissociate the IEBSs, which greatly improves the photoresponse of optoelectronic devices based on the proposed monolayer graphene/RbAg4I5 composite nanostructure.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High-Responsivity Photodetector Based on a Suspended Monolayer Graphene/RbAg₄I₅ Composite Nanostructure

Wang

Yin

et al. 2020

ACS Appl. Mater. Interfaces

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“…Upon application of an electric field, the silver ions can move from the anode to cathode through zigzag channels formed by these vacancies [23][24][25]. RbAg 4 I 5 is widely used to prepare silver nanomaterials [11,26,27], photoresponsive composite nanostructures [28,29], and artificial mixed conductors [30]. Thus, in the present study, RbAg 4 I 5 was used as a channel for transporting silver ions from the anode to cathode.…”

Section: Introductionmentioning

confidence: 97%

Growth mechanism and photoelectric properties of a silver nanowire network prepared by solid state ionics method

Hu²,

Wang³

et al. 2020

Nanotechnology

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A macroscopic silver nanowire (AgNW) network is grown by solid state ionics method. The ion flow during growth of the AgNW network is controlled by maintaining a current in the order of 10 −7 A. Scanning electron microscopy (SEM) analysis reveals that the growth direction of AgNWs in the network is irregular and spread evenly in all directions and the nanowires are 40-160 nm in diameter. The microcosmic mechanism of silver nanostructures grown by the solid state ionics method is established by real time and in situ SEM analysis of the growth process of the AgNW networks. To study the photoelectric properties of the network, a self-supported AgNW network sample (~1 mm wide and 8 mm long) is irradiated with lasers of different wavelengths of 375, 405, 532, 633, 808, and 1064 nm and 10.6 µm, and changes in the current between the two ends of the sample are recorded. The network displays negative photoconductance effect, and the maximum light responsivity is 43 mA W −1 . The network displays light responsivity in the ultraviolet light-to-mid-infrared light region, with response times of tens of milliseconds. These findings indicate that the AgNW network has broad application prospect in ultra-wide spectrum photoelectric detection.

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“…The high ion conductivity originates from networks of crystal-structure passageways produced by silver sites [21][22][23]. Up to now, many works based on RbAg 4 I 5 have been focused on silver nanomaterials [24][25][26], photoresponsive composite nanostructures [27,28], and artificial mixed conductors [29]. Recently, Ag/Au alloy nanowires have been grown though transport passageways in RbAg 4 I 5 under the electric field [30], indicating that RbAg 4 I 5 could have an interaction with Au.…”

Section: Introductionmentioning

confidence: 99%

Self-assembled gold micro/nanostructure arrays based on superionic conductor RbAg₄I₅ films

Wang¹,

Liu²,

Yin³

et al. 2018

Nanotechnology

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Herein, we propose a new strategy to fabricate gold (Au) micro/nanostructure arrays by photocatalytic solid-state electrochemical reaction between superionic conductor RbAg4I5 and Au films. The Au and RbAg4I5 films were successively deposited on a clean quartz substrate by vacuum thermal deposition method. A copper microgrid possessing periodic holes 100 μm in diameter was put above the RbAg4I5 film as a mask plate, whereupon irradiation from a 405 nm wavelength laser was used to diffuse gold ions (Au+ ions) into vacant silver sites of RbAg4I5 and transfer Au+ through ion passageways in the RbAg4I5 film. When the laser was turned off, the Au+ ions were easily reduced due to low activity compared to the silver (Ag+) ions. After multiple on/off cycles of the 405 nm laser, the irradiated area of uniform Au film exhibited a periodic structural unit array whose period was the same as that of the mask plate hole array. Atomic force microscope and scanning electron microscope images revealed that a self-assembled needle-like nanostructure array grew perpendicular to the substrate surface inside each circle’s structural unit. The height of the grown nanostructure array increased with laser power density. Raman enhancement of the gold nanostructure array as substrate was detected using Rhodamine 6G (R6G) ethanol solutions as probe molecules. The enhancement effect increased with the height of the grown nanostructure array, and could increase by two orders of magnitude greater than that of unirradiated Au film. This strategy offers a new method for the micro/nanostructure processing of gold and provides microscale-array-mediated surface-enhancement Raman-scattering (SERS) substrates comprising Au nanostructures for application in high-sensitivity spectrum analysis.

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Ion-modulated nonlinear electronic transport in carbon nanotube bundle/RbAg4I5 thin film composite nanostructures

Cited by 7 publications

References 35 publications

High-Responsivity Photodetector Based on a Suspended Monolayer Graphene/RbAg₄I₅ Composite Nanostructure

High-Responsivity Photodetector Based on a Suspended Monolayer Graphene/RbAg₄I₅ Composite Nanostructure

Growth mechanism and photoelectric properties of a silver nanowire network prepared by solid state ionics method

Self-assembled gold micro/nanostructure arrays based on superionic conductor RbAg₄I₅ films

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Ion-modulated nonlinear electronic transport in carbon nanotube bundle/RbAg4I5 thin film composite nanostructures

Cited by 7 publications

References 35 publications

High-Responsivity Photodetector Based on a Suspended Monolayer Graphene/RbAg4I5 Composite Nanostructure

High-Responsivity Photodetector Based on a Suspended Monolayer Graphene/RbAg4I5 Composite Nanostructure

Growth mechanism and photoelectric properties of a silver nanowire network prepared by solid state ionics method

Self-assembled gold micro/nanostructure arrays based on superionic conductor RbAg4I5 films

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Product

Resources

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High-Responsivity Photodetector Based on a Suspended Monolayer Graphene/RbAg₄I₅ Composite Nanostructure

High-Responsivity Photodetector Based on a Suspended Monolayer Graphene/RbAg₄I₅ Composite Nanostructure

Self-assembled gold micro/nanostructure arrays based on superionic conductor RbAg₄I₅ films