© The Institution of Engineering and Technology
A capacitive micromachined ultrasonic transducer (CMUT) with a graphene membrane is reported. The CMUT membranes were commonly made from very thin silicon nitride or metal material. To date, no graphene CMUT has been successfully used. In this reported work, a photomask were used for the cavity pattern to make a 1μm layer EPON SU-8 photoresist on the silicon substrate. Then a single-layer graphene were tranferred directly to be attached to the EPON SU-8 cavity layer to form the CMUT with a graphene membrane. The resonance frequency was measured to be 95 MHz in air.
References
-
-
1)
-
C.Y. Chen ,
S. Rosenblatt ,
K.I. Bolotin
.
Performance of monolayer graphene nanomechanical resonators with electrical readout.
Nat. Nanotechnol.
,
861 -
867
-
2)
-
J.S. Bunch ,
A.M. van der Zande ,
S.S. Verbridge
.
Electromechanical resonators from graphene sheets.
Science
,
490 -
493
-
3)
-
6. Suk, J.W., Kirk, K., Hao, Y.F., Hall, N.A., Ruoff, R.S.: ‘Thermoacoustic sound generation from monolayer graphene for transparent and flexible sound sources’, Adv. Mater., 2012, 24, (47), pp. 6342–6347 (doi: 10.1002/adma.201201782).
-
4)
-
4. Wei, D., Mitchell, J.I., Tansarawiput, C., et al : ‘Laser direct synthesis of graphene on quartz’, Carbon, 2013, 53, pp. 374–379 (doi: 10.1016/j.carbon.2012.11.026).
-
5)
-
7. Zhou, Q., Zettl, A.: ‘Electrostatic graphene loudspeaker’, Appl. Phys. Lett., 2013, 102, p. 223109 (doi: 10.1063/1.4806974).
-
6)
-
2. Tian, H., Xie, D., Yang, Y., et al: ‘Single-layer graphene sound-emitting devices: experiments and modeling’, Nanoscale, 2012, 4, pp. 2272–2277 (doi: 10.1039/c2nr11572g).
-
7)
-
1. Smith, A.D., Vaziri, S., Niklaus, F., et al: ‘Pressure sensors based on suspended graphene membranes’, Solid State Electron., 2013, 88, pp. 89–94 (doi: 10.1016/j.sse.2013.04.019).
http://iet.metastore.ingenta.com/content/journals/10.1049/mnl.2014.0421
Related content
content/journals/10.1049/mnl.2014.0421
pub_keyword,iet_inspecKeyword,pub_concept
6
6
Capacitive micromachined ultrasonic transducer (CMUT) array with single-layer graphene membrane