Forschungs- & Entwicklungsinformationsdienst der Gemeinschaft - CORDIS

Mass sensitivity measurements

The mass of a 40fg glycerine drop has been measured by using an e-beam defined 20 mm long, 500nm wide and 600nm thick nano-cantilever operated in air. The drop has been locally deposited at the free nanocantilever end by means of an STM gold tip. Resonant frequency has been measured right before and after drop deposition through the CMOS readout circuitry, giving a decreasing of 14.8kHz. From this frequency shift and from the mass of the drop a mass sensitivity of approximately 3ag/Hz has been experimentally determined.

Potential near future projection and applications of this result goes in two directions:
- Operation of the sensor in vacuum will increase the Q factor and consequently the phase/frequency slope, giving to an increase on frequency shift sensitivity. Improvements of Q-factor from 25 in air to 5200 below 0.5mbar have been demonstrated.

- Local deposition of glycerine using an STM tip opens the possibility to functionalise the active free end of the cantilever by using other viscous liquid phase components.

Reported by

Department of Electronic Engineering
Universitat Autònoma de Barcelona. Edifici Q. Escola Tècnica Superior d’Enginyeria
08193 Bellaterra (Barcelona)
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