Visible Photoresponse of Single‐Layer Graphene Decorated with TiO<sub>2</sub> Nanoparticles

Zheng, Keyan; Meng, Fanben; Jiang, Lin; Yan, Qingyu; Hng, Huey Hoon; Chen, Xiaodong

doi:10.1002/smll.201202885

Cited by 60 publications

(58 citation statements)

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“…[60][61][62]68 ] Upon irradiation with UV light, TiO 2 -NPs undergo charge separation to yield electrons and holes, and rGO mainly plays a role in conducting the electrons due to its remarkable electrical transport property. [ 62,68,69 ] In our rGO/TiO 2 -NP hybrid architectures, R m (TiO 2 : rGO) can be up to 10 or even more. Large …”

Section: Communicationmentioning

confidence: 99%

A Universal Strategy to Prepare Functional Porous Graphene Hybrid Architectures

et al. 2014

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Section: Communicationmentioning

confidence: 99%

A Universal Strategy to Prepare Functional Porous Graphene Hybrid Architectures

et al. 2014

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“…Hybrid graphene photodetectors are promising for visible light detection due to the combination of the materials with high light absorption and graphene with ultrahigh carrier mobilties . Visible photodetectors based on PbS‐QD‐decorated graphene was reported by D. Zhang et al The device had the typical bottom‐gate‐top‐contact structure.…”

Section: Visible Sensitive Gfetsmentioning

confidence: 99%

“…K. Zheng et al reported the visible photoresponse of GFETs based on single layer graphene decorated with TiO 2 nanoparticles . Graphene on a SiO 2 /Si substrate was immersed into well dispersed TiO 2 ethanol solution and formed a TiO 2 ‐graphene hybrid film as the active layer of a GFET.…”

Section: Visible Sensitive Gfetsmentioning

confidence: 99%

Photosensitive Graphene Transistors

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High performance photodetectors play important roles in the development of innovative technologies in many fields, including medicine, display and imaging, military, optical communication, environment monitoring, security check, scientific research and industrial processing control. Graphene, the most fascinating two-dimensional material, has demonstrated promising applications in various types of photodetectors from terahertz to ultraviolet, due to its ultrahigh carrier mobility and light absorption in broad wavelength range. Graphene field effect transistors are recognized as a type of excellent transducers for photodetection thanks to the inherent amplification function of the transistors, the feasibility of miniaturization and the unique properties of graphene. In this review, we will introduce the applications of graphene transistors as photodetectors in different wavelength ranges including terahertz, infrared, visible, and ultraviolet, focusing on the device design, physics and photosensitive performance. Since the device properties are closely related to the quality of graphene, the devices based on graphene prepared with different methods will be addressed separately with a view to demonstrating more clearly their advantages and shortcomings in practical applications. It is expected that highly sensitive photodetectors based on graphene transistors will find important applications in many emerging areas especially flexible, wearable, printable or transparent electronics and high frequency communications.

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“…The fabrication process of the ionic liquid gated Ag-NP/graphene nanohybrid FETs is depicted schematically in Figure 1 , consisting of six steps: CVD graphene sheet transferred onto substrate (Figure 1 a), electrode deposition on graphene (Figure 1 b), graphene FET fabrication (Figure 1 c), Ag-NP selfassembly on graphene FET channel (Figure 1 d), ionic liquid gate Graphene, an atomic layer of carbon atoms arranged in the honeycomb lattice, [1][2][3] has been one of the most attractive materials for optoelectronics because of its unique properties of remarkable charge mobility, high optical transmittance, chemical inertness and mechanical fl exibility. One strategy employs nanostructured semiconductor photosensitizers/graphene hybrids, in which light absorption is achieved using nanoparticles, [ 10 ] nanorods, [ 11,12 ] or quantum dots. However, the light absorption of ∼2.3% per layer of graphene [ 5 ] results in its relatively low photoresponsivity as compared to its conventional semiconductor counterparts employing typically absorber materials of tens to hundreds of nanometers in thickness.…”

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Photodetection Based on Ionic Liquid Gated Plasmonic Ag Nanoparticle/Graphene Nanohybrid Field Effect Transistors

Liu

et al. 2014

Advanced Optical Materials

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729 wileyonlinelibrary.com COMMUNICATION www.MaterialsViews.com www.advopticalmat.denanostructures and the complicated ligand exchange process required present challenges for practical applications. [ 14,17 ] This motivates our work in exploring new mechanisms on graphene that do not deal with the above mentioned diffi culties for photodetection.The charge carrier density and hence electrical conductivity of graphene is highly susceptive to, and can be tuned by, gate electrostatic fi eld E G . The on/off ratio is over 5 in double-layer graphene fi eld-effect transistors (FETs) at E G ∼3 MV/cm. [ 18 ] Higher gating effi ciency, defi ned as the change of graphene channel conductivity per applied gate voltage V G , can be obtained at larger gate capacitance, which can be achieved by using thinner high-κ dielectrics. A promising alternative is to use ionic liquid gate, which is highly effi cient due to the formation of an electric double-layer with extremely small spacing on the order of 1 nm (the Debye length) near the graphene/ion liquid interface. [ 19 ] This renders a high gating efficiency on graphene. [ 20,21 ] A recent work on ionic liquid gated graphene FETs reveals the double-layer capacitance is as high as 9.2-21 µF/cm 2 , [ 22,23 ] approximately 2-3 orders of magnitude higher than the back-gate capacitance using a layer of 90 nm SiO 2 (∼38 nF/cm 2 ). In addition, the ionic liquid-gated graphene has shown to reach a high doping level of 5 × 10 13 /cm 2 , [ 24 ] mainly due to the ultrahigh breakdown fi eld on the order of 1 MV/cm. [ 25 ] The high-effi ciency electrical gating of the ionic liquid may be correlated to an incident light through incorporation of plasmonic nanostructures on graphene FETs. It is known that an evanescent fi eld can be generated near the nanostructure surface as a consequence of localized surface plasmonic resonance (LSPR) upon absorption of light with matching frequency to LSPR of the nanostructure. [26][27][28][29] Setting up a correlation between LSPR and the graphene FET gating may provide a highly effi cient way to generate large photoconductivity and hence a new scheme for photodetection with high sensitivity. [ 30 ] An additional advantage of this scheme is the wavelength tunability determined by the LSPR frequency of the plasmonic nanostructure. By selecting plasmonic nanostructures of desired LSPR frequencies, photodetection at the targeted frequency range may be realized in a spectrum determined by the materials and geometric parameters of the plasmonic nanostructures. [ 31 ] Herein, we report a novel graphene photodetector based on plasmonic Ag-NP/graphene nanohybrids FETs with an ionic liquid top gate. The fabrication process of the ionic liquid gated Ag-NP/graphene nanohybrid FETs is depicted schematically in Figure 1 , consisting of six steps: CVD graphene sheet transferred onto substrate (Figure 1 a), electrode deposition on graphene (Figure 1 b), graphene FET fabrication (Figure 1 c), Ag-NP selfassembly on graphene FET channel (Figure 1 d), ionic liquid gate Graphene...

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Visible Photoresponse of Single‐Layer Graphene Decorated with TiO₂ Nanoparticles

Cited by 60 publications

References 31 publications

A Universal Strategy to Prepare Functional Porous Graphene Hybrid Architectures

A Universal Strategy to Prepare Functional Porous Graphene Hybrid Architectures

Photosensitive Graphene Transistors

Photodetection Based on Ionic Liquid Gated Plasmonic Ag Nanoparticle/Graphene Nanohybrid Field Effect Transistors

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Visible Photoresponse of Single‐Layer Graphene Decorated with TiO2 Nanoparticles

Cited by 60 publications

References 31 publications

A Universal Strategy to Prepare Functional Porous Graphene Hybrid Architectures

A Universal Strategy to Prepare Functional Porous Graphene Hybrid Architectures

Photosensitive Graphene Transistors

Photodetection Based on Ionic Liquid Gated Plasmonic Ag Nanoparticle/Graphene Nanohybrid Field Effect Transistors

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Visible Photoresponse of Single‐Layer Graphene Decorated with TiO₂ Nanoparticles