Capacitance-Based Microfluidic Sensors

Capacitance-based microfluidic sensors characterize micro-/nanoparticles or cells by measuring capacitance change using integrated electrically charged and isolated pair electrodes in a microfluidic chip. 

Capacitance-based microfluidic sensors have emerged as a powerful tool and been widely used in sensing pressure, position, biological cells, etc., since it has many advantages such as low cost and being compact, which makes capacitance-based microfluidic sensors of great potential use for point-of-care diagnosis. In this short entry, the mechanism, current applications, limitations, and perspectives of capacitance-based microfluidic method are introduced in details. 

Capacitance-Based Microfluidic Sensors, Fig. 8 Experimental setup schematic for measuring electrode capacitance and droplet position... 

Despite many advantages of capacitance-based microfluidic sensor such as cost-effectiveness, portability, etc., the major concern remaining is the integration of the readout electronics. In the mentioned systems above, IDEs are easily able to be... 

Recently, Baoqing et al. introduced a low-cost microfluidic droplet capacitance-based pressure sensor using elastic and capacitive electrode-electrolyte interfaces to implement ultra-sensitivity reported at 1.59 pF/kPa and a resolution of 1.8 Pa [4], As Fig. 5 shows, the... 

It has been known that the electric double layer (EDL) presents large capacitance per unit area at the interface between an electrode and electrolyte. Based upon this mechanism, the capacitance-based application like energy storages and digital microfluidic sensor has been... 

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