Utilizing Parasitic Capacitance of Single‐Droplet Electricity Generator For Specific Bacterial Detection

Abstract

Single‐droplet electricity generator (SDEG) has superior potential over other solid–liquid triboelectric nanogenerators (TENGs) for energy harvesting. However, its shunting effect of parasitic capacitance is adverse and unavoidable, resulting in the reduction of the SDEG voltage. In addition, TENG‐based bacterial biosensors are still facing issues of incompetence in resolution, precision, and specificity. Therefore, a novel SDEG‐based bacterial biosensor is developed by making use of parasitic capacitance. By taking the advantages of aptamer and parasitic capacitance, the Pseudomonas aeruginosa (P. aeruginosa) can be specifically and precisely detected via signal change from a single droplet without energy accumulation. This study proves that the SDEG‐based bacterial biosensor exhibits an excellent performance for P. aeruginosa detection in low limit of detection (4.5×103 CFU mL−1) with high selectivity. Meanwhile, the established mathematical model yields consistent results to the experimental ones, which serves as a solid basis for quantifying bacterial concentration. This work contributes to TENG‐based bacterial biosensor, and opens up a new way for the diversified application of SDEG.

Enhancement of the voltage output of droplet electricity generators using high dielectric high-entropy oxide composites

“…The voltage output ( U ) of the SDEG-based DNA sensor can be described by eqn (10).When CNT-modified DNA is present in deionized water, the amount of charge generated due to the adsorption effect is greatly reduced, thereby lowering U D . The actual voltage output ( U R ) can be calculated as: 42 where Q R is the reduced charge due to the adsorption of CNT-modified DNA Q R = end EDL A water n = an s …”

Collaborative Optimization Design of Self-Powered Sterilizer with Highly Efficient Synergistic Antibacterial Effect

“…Consequently, the continuous development of TENGs has led to the emergence of self-powered systems . These self-powered systems, such as self-powered sterilizers − and biosensors, , hold significant importance in various circumstances, including offshore environments. To facilitate the applications of self-powered systems, researchers have diligently explored the optimization of triboelectric materials, , the design of device structures, and the management of electrical circuits .…”

Portable Saliva Sensor Based on Dual Recognition Elements for Detection of Caries Pathogenic Bacteria

“…mutans. Aptamers are small single-stranded nucleic acid sequences (DNA), which exhibit much higher long-term stability than antibodies in a wide range of temperature, pH, and ionic strength. ,,− Aptamer–nanozyme interfaces have been fabricated by Tang and co-workers to colorimetrically detect S. mutans in artificial saliva systems .…”