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Numerical analysis of zeptogram/Hz-level mass responsivity for in-plane resonant nano-electro-mechanical sensors
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Numerical Analysis of Zeptogram/Hz-Level Mass Responsivity for In-Plane Resonant Nano-Electro-Mechanical Sensors
No full textThis paper presents numerical analysis of an in-plane resonant Nano-Electro-Mechanical (NEM) sensor based on mass-detection principle using a 3D FEM electromechanical simulation combined with a NEM/MOS hybrid circuit simulation. The self-assembled linker molecules are modeled simply by adding extra surface coating layer, and three different functionalization schemes are studied: top and bottom, only top and all-around configurations. We investigate the impacts of the coating layer mass change as well as stiffness change on the resonance frequency by varying thickness of the coating layer for all the configurations. The small signal AC analysis of the sensor is performed, and the effect of the coating layer on the output signal is studied. Mass of the coating layer is then changed in order to model the random adsorption of target molecules onto the coating layer surface. We show that the NEM sensor enables to achieve the mass responsivity of 0.05 zeptogram/Hz for all the different functionalization schemes, which is approximately eleven orders smaller than that reported for present quartz crystal microbalance sensors. Moreover, we clarify that the scaling rule of the mass responsivity is given by k4 regardless of the different functionlization configurations
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Double MZI micro-opto-mechanical pressure sensors for increased sensitivity and pressure range
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