A novel flexible capacitive touch pad based on graphene oxide film

Tian, He; Yang, Yi; Xie, Dan; Ren, Tian‐Ling; Shu, Yi; Zhou, Changjian; Sun, Hui; Li, Xuan; Zhang, Cang-Hai

doi:10.1039/c2nr33455k

Cited by 39 publications

(21 citation statements)

References 34 publications

(31 reference statements)

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“…However, the zero bandgap of graphene limits its applications in electronics. Different forms of graphene such as graphene nanoribbons78, bilayer graphene910 and graphene oxide1112 have been reported to possess a bandgap. However, the typical switching ratios of the devices based on these structures is still lower than 10 3 .…”

mentioning

confidence: 99%

Novel Field-Effect Schottky Barrier Transistors Based on Graphene-MoS2 Heterojunctions

Tian

Tan

et al. 2014

Sci Rep

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143

134

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Recently, two-dimensional materials such as molybdenum disulphide (MoS2) have been demonstrated to realize field effect transistors (FET) with a large current on-off ratio. However, the carrier mobility in backgate MoS2 FET is rather low (typically 0.5–20 cm2/V·s). Here, we report a novel field-effect Schottky barrier transistors (FESBT) based on graphene-MoS2 heterojunction (GMH), where the characteristics of high mobility from graphene and high on-off ratio from MoS2 are properly balanced in the novel transistors. Large modulation on the device current (on/off ratio of 105) is achieved by adjusting the backgate (through 300 nm SiO2) voltage to modulate the graphene-MoS2 Schottky barrier. Moreover, the field effective mobility of the FESBT is up to 58.7 cm2/V·s. Our theoretical analysis shows that if the thickness of oxide is further reduced, a subthreshold swing (SS) of 40 mV/decade can be maintained within three orders of drain current at room temperature. This provides an opportunity to overcome the limitation of 60 mV/decade for conventional CMOS devices. The FESBT implemented with a high on-off ratio, a relatively high mobility and a low subthreshold promises low-voltage and low-power applications for future electronics.

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mentioning

confidence: 99%

Novel Field-Effect Schottky Barrier Transistors Based on Graphene-MoS2 Heterojunctions

Tian

Tan

et al. 2014

Sci Rep

Self Cite

143

134

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“…Complicated tactile sensing system under bland skin is illustrated in Figure 15 . At present, pressure sensors are primarily based on the strength induced variation in capacitance,149, 150 piezoelectricity,151, 152 resistivity,17 triboelectricity 153. And graphene has been applied in the design of light and wearable pressure sensors.…”

Section: The Human‐like Senses and Feedbacksmentioning

confidence: 99%

“…The good linearity further confirms the stability and uniformity of the films. GO film is also functioned as the dielectric layer for sustaining heavy strains and a flexible capacitive touch pad 149. Moreover, the capacitor structure has been measured to exhibit high response sensitivity with fast touch rates.…”

Section: The Human‐like Senses and Feedbacksmentioning

confidence: 99%

Human‐Like Sensing and Reflexes of Graphene‐Based Films

et al. 2016

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Humans have numerous senses, wherein vision, hearing, smell, taste, and touch are considered as the five conventionally acknowledged senses. Triggered by light, sound, or other physical stimulations, the sensory organs of human body are excited, leading to the transformation of the afferent energy into neural activity. Also converting other signals into electronical signals, graphene‐based film shows its inherent advantages in responding to the tiny stimulations. In this review, the human‐like senses and reflexes of graphene‐based films are presented. The review starts with the brief discussions about the preparation and optimization of graphene‐based film, as where as its new progress in synthesis method, transfer operation, film‐formation technologies and optimization techniques. Various human‐like senses of graphene‐based film and their recent advancements are then summarized, including light‐sensitive devices, acoustic devices, gas sensors, biomolecules and wearable devices. Similar to the reflex action of humans, graphene‐based film also exhibits reflex when under thermal radiation and light actuation. Finally, the current challenges associated with human‐like applications are discussed to help guide the future research on graphene films. At last, the future opportunities lie in the new applicable human‐like senses and the integration of multiple senses that can raise a revolution in bionic devices.

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“…Although using nonaqueous electrolytes can improve a supercapacitor's operating voltage window, the organic electrolytes also suffer from problems such as conductivity, environmental safety, and cost . Therefore, much research focus remains on developing new electrode materials [].…”

Section: Introductionmentioning

confidence: 99%

Effect of carbon nanotube loadings on supercapacitor characteristics

Huang

Kirk

Thorpe

et al. 2014

Int. J. Energy Res.

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SUMMARYIn order to improve the properties of electrodes based on carbon nanotubes (CNTs), nanocomposite electrodes of CNTs/ activated carbon (AC) are prepared. The effect of CNT loadings on the performance of the nanocomposite electrodes is evaluated by electrochemical methods. Scanning electron microscopy images show the CNTs are well dispersed, entwine with the AC, and form a more conductive network in a nanocomposite electrode. When CNT loadings increase from 0 to 10 wt%, the capacitance increases by 15% (89.4 to 102.5 F g À1 ), and the equivalent series resistance (ESR) decreases by 13% (0.93 to 0.81 Ω). The capacitance improvement has an optimum CNT loading of about 6 to 10 wt%. The decreased ESR with high CNT loadings does not prevent capacitance loss at sweep rates greater than 50 mV s À1. The nanocomposite electrode shows good cycle performance with no capacity loss after 5000 cycles at a scan rate of 500 mV s À1 . These results indicate that the CNT-based nanocomposite electrodes would be a promising material for use in supercapacitors. Copyright

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A novel flexible capacitive touch pad based on graphene oxide film

Cited by 39 publications

References 34 publications

Novel Field-Effect Schottky Barrier Transistors Based on Graphene-MoS2 Heterojunctions

Novel Field-Effect Schottky Barrier Transistors Based on Graphene-MoS2 Heterojunctions

Human‐Like Sensing and Reflexes of Graphene‐Based Films

Effect of carbon nanotube loadings on supercapacitor characteristics

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