Short CommunicationEffect of surface stress on microcantilever resonance frequency during water adsorption: influence of microcantilever dimensions
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Acknowledgments
Authors would like to thank Dr. P.R. Vasudeva Rao, Director, IGCAR for his support and encouragement. One of the author, KL acknowledges Department of Atomic energy, India for the award of senior research fellowship and Dr. A.K. Tyagi, Head, SND, MSG, IGCAR for guidance.
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2022, Applied Materials TodayCitation Excerpt :Most of researches reported a decrease of the resonance frequency during gas adsorption. However, according to the nature of the deposited material (soft material and cluster of bacteria cells), a positive resonance frequency shift can be observed due to surface stress effect depending of certain adsorption distribution over the sensor and dimensions of microcantilever [31,53,56–58]. Lately, it has been observed that benzene (C6H6) adsorption under gas phase can also induce a positive and negative resonance frequency shift according to the amount of gas [12].
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2020, Composite StructuresCitation Excerpt :During the past years the influence of bio-adsorbate-induced surface stress on the stiffness, eigenfrequency and eigenmode of microcantilevers was an intriguing problem along with a few controversies to be settled [13,14]. Most AFM-based biodetection experiments and theories showed that the physical quantities such as adsorbate mass [15–18], stiffness [19,20], and surface stress [21–23] have great influences on dynamic detection signals of microcantilevers if the bio-adsorbate can be viewed as a kind of elastic material. Ramos et al. [24] adopted the Rayleigh’s method to extract the correct information about adsorbed mass.
Effect of biaxial curvature on the resonance frequency of uncoated microcantilevers
2020, Sensors and Actuators, A: PhysicalCitation Excerpt :For example, in the case of gold-coated MCs, adhesion, surface morphology and cleanliness of gold sensing surface is shown to have both qualitative and quantitative effects on the measured surface stress [38,39]. Similarly, in the case of uncoated MCs, surface morphology on opposite sides has a decisive role in the bending magnitude [30] and thus the generated surface stress. However, it is interesting to note that any potential experiment intending to relate the stiffness changes with surface stress needs physical/chemical modification of its surface and the associated artifacts are inevitable.
Role of surface morphology on desorption kinetics of water molecules from uncoated silicon microcantilever
2016, Sensors and Actuators, B: ChemicalCitation Excerpt :Many theoretical models as well as experimental studies have been reported in the literature to understand the influence of surface stress on the resonance frequency of MCs [33–38]. This effect is also dependent on MC dimensions and we have recently shown that for the MC used in the present work (450 μm × 40 μm × 2.5 μm), the influence of surface stress induced stiffness changes during water molecule adsorption is negligible [39]. In conclusion, we have studied the desorption kinetics of water molecules from uncoated silicon microcantilever surfaces.
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2019, Journal of Micromechanics and Microengineering