TY  - JOUR
ID  - upm11764
UR  - http://www.sciencedirect.com/science/article/pii/S0925400511008859
IS  - 1
A1  - García-Gancedo, Luis
A1  - Zhu, Z.
A1  - Iborra Grau, Enrique
A1  - Clement Lorenzo, Marta
A1  - Olivares Roza, Jimena
A1  - Flewitt, A.J.
A1  - Milne, W.I.
A1  - Ashley, G.M.
A1  - Luo, J.K.
A1  - Zhao, X.B.
A1  - Lu, J.R.
Y1  - 2011///
N2  - Solidly mounted resonators (SMRs) with a top carbon nanotubes (CNTs) surface coating that doubles as an electrode and as a sensing layer have been fabricated. The influence of the CNTs on the frequency response of the resonators was studied by direct comparison to identical devices with a top metallic electrode. It was found that the CNTs introduced significantly less mass load on the resonators and these devices exhibited a greater quality factor, Q (>2000, compared to ?1000 for devices with metal electrodes), which increases the gravimetric sensitivity of the devices by allowing the tracking of smaller frequency shifts. Protein solutions with different concentrations were loaded on the top of the resonators and their responses to mass-load from physically adsorbed coatings were investigated. Results show that resonators using CNTs as the top electrode exhibited a higher frequency change for a given load (?0.25 MHz cm2 ng?1) compared to that of a metal thin film electrode (?0.14 MHz cm2 ng?1), due to the lower mass of the CNTelectrodes and their higher active surface area compared to that of a thin film metal electrode. It is therefore concluded that the use of CNTelectrodes on resonators for their use as gravimetric biosensors is a significant improvement over metallic electrodes that are normally employed.
PB  - Elsevier B.V.
JF  - Sensors and Actuators B: Chemical
VL  - 160
KW  - Biosensor; Carbon nanotube (CNT); Aluminum nitride (AlN); Bulk acoustic wave resonator (BAW); Gravimetric biosensor
SN  - 0925-4005
TI  - AlN-based BAW resonators with CNT electrodes for gravimetric biosensing
SP  - 1386
AV  - public
EP  - 1393
ER  -