Fast Response and High Sensitivity ZnO/glass Surface Acoustic Wave Humidity Sensors Using Graphene Oxide Sensing Layer

Xuan, Weipeng; He, Mei; Meng, Nan; He, Xin; Wang, Wenbo; Chen, Jinkai; Shi, Tianjin; Hasan, Tawfique; Xu, Zhen; Xu, Yang; Luo, Jikui

doi:10.1038/srep07206

Cited by 160 publications

(105 citation statements)

References 58 publications

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“…For example, SAW devices have been reported that are responsive to hydrogen and carbon monoxide, 6 and moisture. 7,8 Huan et al 9 have very recently reported ZnO/glass humidity sensors with high sensitivity, exploiting a graphene oxide sensing layer, where the frequency response of the sensors was primarily caused by mass loading effects, which were also studied by Whitehead et al in graphene-quartz SAW devices. 10 Illumination of randomly stacked graphene flakes on lithium niobate (LiNbO 3 ) by 633 nm laser light 11 has been shown to modulate the SAW velocity, where this shift in the velocity was attributed to the increase in surface temperature resulting from optical energy absorbed in the graphene layer.…”

mentioning

confidence: 99%

Acoustoelectric photoresponse in graphene

Poole

Bandhu

Nash

2015

Applied Physics Letters

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The acoustoelectric current in graphene has been investigated as a function of illumination, using blue (450 nm) and red (735 nm) light-emitting diodes (LEDs), and surface acoustic wave (SAW) intensity and frequency. The measured acoustoelectric current increases with illumination, more than the measured change in the conductivity of the graphene, whilst retaining a linear dependence on the SAW intensity. The latter is consistent with the interaction between the carriers and SAWs being described by a relatively simple classical relaxation model suggesting that the change in the acoustoelectric current is caused by the effect of the illumination on the electronic properties of the graphene. The increase in the acoustoelectric current is greatest under illumination with the blue LED, consistent with the creation of a hot electron distribution.

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mentioning

confidence: 99%

Acoustoelectric photoresponse in graphene

Poole

Bandhu

Nash

2015

Applied Physics Letters

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“…Theoretical studies predict a range of rich physical phenomena arising from SAW-graphene interactions [14][15][16][17], and graphene's potential as an extraordinarily responsive sensing material [18] is being exploited for the development of SAW sensors. For example, SAW devices that are responsive to hydrogen and carbon monoxide [19], and moisture [20][21][22][23] have been reported. Acoustic charge transport has also very recently been reported in graphene [24,25], and we have investigated it in monolayer graphene, produced by chemical vapor deposition (CVD), and transferred onto lithium niobate SAW devices, both at room temperature [26], at low temperature [27], and under illumination [28].…”

Section: Introductionmentioning

confidence: 99%

Controlling the properties of surface acoustic waves using graphene

Bandhu

Nash

2015

Nano Res.

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Surface acoustic waves (SAWs) are elastic waves that propagate on the surface of a solid, much like waves on the ocean, with SAW devices used widely in communication and sensing. The ability to dynamically control the properties of SAWs would allow the creation of devices with improved performance or new functionality. However, so far it has proved extremely difficult to develop a practical way of achieving this control. In this paper we demonstrate voltage control of SAWs in a hybrid graphene-lithium niobate device. The velocity shift of the SAWs was measured as the conductivity of the graphene was modulated using an ion-gel gate, with a 0.1% velocity shift achieved for a bias of approximately 1 V. This velocity shift is comparable to that previously achieved in much more complicated hybrid semiconductor devices, and optimization of this approach could therefore lead to a practical, cost-effective voltage-controlled velocity shifter. In addition, the piezoelectric fields associated with the SAW can also be used to trap and transport the charge carriers within the graphene. Uniquely to graphene, we show that the acoustoelectric current in the same device can be reversed, and switched off, using the gate voltage.

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“…Furthermore, they can be passive (no power source) and wireless (can be operated remotely) [16]. A large number of applications has been reported in the literature on SAW devices such as SAW chemical, pressure, and temperature sensors, as well as several other commercial applications [17][18][19][20][21]. In this paper, we report the detection of female Aedes mosquitoes in human habitations using a SAW sensor based on the ZnO/IDT/128º YX LiNbO 3 structure.…”

Section: Accepted Manuscriptmentioning

confidence: 94%