Article

Graphene-on-paper sound source devices.

Institute of Microelectronics, Tsinghua University, Beijing 100084, China.
ACS Nano (impact factor: 10.77). 05/2011; 5(6):4878-85. DOI:10.1021/nn2009535 pp.4878-85
Source: PubMed

ABSTRACT We demonstrate an interesting phenomenon that graphene can emit sound. The application of graphene can be expanded in the acoustic field. Graphene-on-paper sound source devices are made by patterning graphene on paper substrates. Three graphene sheet samples with the thickness of 100, 60, and 20 nm were fabricated. Sound emission from graphene is measured as a function of power, distance, angle, and frequency in the far-field. The theoretical model of air/graphene/paper/PCB board multilayer structure is established to analyze the sound directivity, frequency response, and efficiency. Measured sound pressure level (SPL) and efficiency are in good agreement with theoretical results. It is found that graphene has a significant flat frequency response in the wide ultrasound range 20-50 kHz. In addition, the thinner graphene sheets can produce higher SPL due to its lower heat capacity per unit area (HCPUA). The infrared thermal images reveal that a thermoacoustic effect is the working principle. We find that the sound performance mainly depends on the HCPUA of the conductor and the thermal properties of the substrate. The paper-based graphene sound source devices have highly reliable, flexible, no mechanical vibration, simple structure and high performance characteristics. It could open wide applications in multimedia, consumer electronics, biological, medical, and many other areas.

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    Article: Flexible graphite-on-paper piezoresistive sensors.
    Tian-Ling Ren, He Tian, Dan Xie, Yi Yang
    [show abstract] [hide abstract]
    ABSTRACT: We demonstrate novel graphite-on-paper piezoresistive devices. The graphite was used as sensing component. The fabrication process can be finished in a short time with simple tools (e.g., a scissor and a pencil). A small array of six paper-based piezoresistive devices is made. The whole device is flexible. The test results showed that the change of resistance was proportional to the applied force. A paper-based weighing balance was also made as an example of applications. This novel array of paper-based piezoresistive devices will open wide applications in force and acceleration sensing areas.
    Sensors 01/2012; 12(5):6685-94. · 1.74 Impact Factor
Data provided are for informational purposes only. Although carefully collected, accuracy cannot be guaranteed. The impact factor represents a rough estimation of the journal's impact factor and does not reflect the actual current impact factor. Publisher conditions are provided by RoMEO. Differing provisions from the publisher's actual policy or licence agreement may be applicable.

Keywords

acoustic field
 
air/graphene/paper/PCB board multilayer structure
 
consumer electronics
 
frequency response
 
good agreement
 
graphene sheet samples
 
Graphene-on-paper sound source devices
 
infrared thermal images
 
lower heat capacity
 
paper substrates
 
paper-based graphene sound source devices
 
patterning graphene
 
significant flat frequency response
 
sound directivity
 
Sound emission
 
sound performance
 
sound pressure level
 
theoretical model
 
thinner graphene sheets
 
wide ultrasound range 20-50 kHz
 

He Tian