Channel‐Length‐Dependent Field‐Effect Mobility and Carrier Concentration of Reduced Graphene Oxide Thin‐Film Transistors

Kobayashi, Tomonao; Kimura, Nozomi; Chi, J.Y.; Hirata, Shintaro; Hobara, Daisuke

doi:10.1002/smll.200902407

Cited by 87 publications

(88 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We note that the assynthesized GO sheets were electrically active without any further chemical and/or thermal treatment, in contrast to chemically derived GO [8][9][10][11] , and the measured carrier (hole) mobility of the GO sheet with O/C composition of 0.32 is superior to the previously reported mobility values of chemically reduced GObased FETs 1,42-44 . The higher overall mobilities in our devices, compared with those achieved in chemically reduced GO flakes, could be attributed to the morphological nature of the monolithic GO sheets without any junction/overlapping regions between graphitic grains since the weak coupling between adjacent GO flakes (that is, the high internanosheet resistance) may cause the device performance to be much less than that of single nanosheets 45 . In addition, the conductivity of both samples at all gate voltages from À 80 to þ 80 V increased with temperature, indicating that both types exhibit semiconducting behaviour, in contrast to the semimetallic prinstine graphene 41 .…”

Section: Synthesis Of the Go Sheetsmentioning

confidence: 76%

Monolithic graphene oxide sheets with controllable composition

et al. 2014

View full text Add to dashboard Cite

Graphene oxide potentially has multiple applications and is typically prepared by solutionbased chemical means. To date, the synthesis of a monolithic form of graphene oxide that is crucial to the precision assembly of graphene-based devices has not been achieved. Here we report the physical approach to produce monolithic graphene oxide sheets on copper foil using solid carbon, with tunable oxygen-to-carbon composition. Experimental and theoretical studies show that the copper foil provides an effective pathway for carbon diffusion, trapping the oxygen species dissolved in copper and enabling the formation of monolithic graphene oxide sheets. Unlike chemically derived graphene oxide, the as-synthesized graphene oxide sheets are electrically active, and the oxygen-to-carbon composition can be tuned during the synthesis process. As a result, the resulting graphene oxide sheets exhibit tunable bandgap energy and electronic properties. Our solution-free, physical approach may provide a path to a new class of monolithic, two-dimensional chemically modified carbon sheets.

show abstract

Section: Synthesis Of the Go Sheetsmentioning

confidence: 76%

Monolithic graphene oxide sheets with controllable composition

et al. 2014

View full text Add to dashboard Cite

show abstract

“…The sensitivity of the fabricated device ranges from 0.25 to 0.63% °C −1 , which is better than the properties of RTDs fabricated on a fl exible substrate. [ 5,39 ] Based on the charge-hopping transport mechanism of R-GO thin fi lms, [83][84][85] Trung and coworkers [ 67,86 ] developed a fl exible temperature sensor using an R-GO/P(VDF-TrFE) nanocomposite as the sensing layer. The fl exible temperature sensor in the form of an FET structure is presented in Figure 3 a.…”

Section: Thermistorsmentioning

confidence: 99%

“…Studies of electronic conduction in R-GO networked fi lms have shown that conduction is attributed to two main components: i) the intra-nanosheet resistance ( R intra ), which is controlled by structural defects of single R-GO nanosheets, and ii) the inter-nanosheet resistance ( R inter ), which is affected by the nanosheet junctions. [83][84][85]142 ] Under the strain mode, the resistance of a networked R-GO fi lm is expected to be strongly modulated because of the changing of R inter at the nanosheet junctions. Based on these aspects, networked R-GO thin fi lms can be used to fabricate piezoresistive strain sensors.…”

Section: Reviewmentioning

confidence: 99%

Flexible and Stretchable Physical Sensor Integrated Platforms for Wearable Human‐Activity Monitoringand Personal Healthcare

2016

View full text Add to dashboard Cite

Flexible and stretchable physical sensors that can measure and quantify electrical signals generated by human activities are attracting a great deal of attention as they have unique characteristics, such as ultrathinness, low modulus, light weight, high flexibility, and stretchability. These flexible and stretchable physical sensors conformally attached on the surface of organs or skin can provide a new opportunity for human-activity monitoring and personal healthcare. Consequently, in recent years there has been considerable research effort devoted to the development of flexible and stretchable physical sensors to fulfill the requirements of future technology, and much progress has been achieved. Here, the most recent developments of flexible and stretchable physical sensors are described, including temperature, pressure, and strain sensors, and flexible and stretchable sensor-integrated platforms. The latest successful examples of flexible and stretchable physical sensors for the detection of temperature, pressure, and strain, as well as their novel structures, technological innovations, and challenges, are reviewed first. In the next section, recent progress regarding sensor-integrated wearable platforms is overviewed in detail. Some of the latest achievements regarding self-powered sensor-integrated wearable platform technologies are also reviewed. Further research direction and challenges are also proposed to develop a fully sensor-integrated wearable platform for monitoring human activity and personal healthcare in the near future.

show abstract

“…High mobility (∼ 10,000 cm 2 /Vs) 15 epitaxial graphene can be obtained in thermal decomposition of SiC, however high cost and limited SiC wafer size may restrain its wide applications. The chemical reduction of GO can also produce graphene-based connected films in large-scale, but the major drawback is low electrical mobility (∼ 1 cm 2 /Vs) 16,17 originating from their defective structures. Among these methods, metal catalytic CVD has become one of the most promising ways in synthesizing large-scale graphene films since this method gives transferable high-quality graphene films with high yield, relatively low cost and large area whose size is limited only by the metal substrate and furnace.…”

Section: Introductionmentioning

confidence: 99%

Synthetic Graphene Grown by Chemical Vapor Deposition on Copper Foils

Chung

Shen²,

Cao

et al. 2013

Int. J. Mod. Phys. B

View full text Add to dashboard Cite

The discovery of graphene, a single layer of covalently bonded carbon atoms, has attracted intense interest. Initial studies using mechanically exfoliated graphene unveiled its remarkable electronic, mechanical and thermal properties. There has been a growing need and rapid development in large-area deposition of graphene film and its applications. Chemical vapor deposition on copper has emerged as one of the most promising methods in obtaining large-scale graphene films with quality comparable to exfoliated graphene. In this chapter, we review the synthesis and characterizations of graphene grown on copper foil substrates by atmospheric pressure chemical vapor deposition. We also discuss potential applications of such large-scale synthetic graphene.

show abstract

Channel‐Length‐Dependent Field‐Effect Mobility and Carrier Concentration of Reduced Graphene Oxide Thin‐Film Transistors

Cited by 87 publications

References 37 publications

Monolithic graphene oxide sheets with controllable composition

Monolithic graphene oxide sheets with controllable composition

Flexible and Stretchable Physical Sensor Integrated Platforms for Wearable Human‐Activity Monitoringand Personal Healthcare

Synthetic Graphene Grown by Chemical Vapor Deposition on Copper Foils

Contact Info

Product

Resources

About