Search

Abstract Fabricating flexible pressure sensors with high sensitivity in a broad pressure range is still a challenge. Herein, a flexible pressure sensor with engineered microstructures on polydimethylsiloxane (PDMS) film is designed. The high performance of the sensor derives from its unique pyramid‐wall‐grid microstructure (PWGM). A square array of dome‐topped pyramids and crossed strengthening walls on the film forms a multiheight hierarchical microstructure. Two pieces of PWGM flexible PDMS film, stacked face‐to‐face, form a piezoresistive sensor endowed with ultrahigh sensitivity across a very broad pressure range. The sensitivity of the device is as high as 383 665.9 and 269 662.9 kPa−1 in the pressure ranges 0–1.6 and 1.6–6 kPa, respectively. In the higher pressure range of 6.1–11 kPa, the sensitivity is 48 689.1 kPa−1, and even in the very high pressure range of 11–56 kPa, it stays at 1266.8 kPa−1. The pressure sensor possesses excellent bending and torsional strain detection properties, is mechanically durable, and has potential applications in wearable biosensing for healthcare. In addition, 2 × 2 and 4 × 4 sensor arrays are prepared and characterized, suggesting the possibility of manufacturing a flexible tactile sensor.

Fabricating flexible pressure sensors with high sensitivity in a broad pressure range is still a challenge. Herein, a flexible pressure sensor with engineered microstructures on polydimethylsiloxane (PDMS) film is designed. The high performance of the sensor derives from its unique pyramid‐wall‐grid microstructure (PWGM). A square array of dome‐topped pyramids and crossed strengthening walls on the film forms a multiheight hierarchical microstructure. Two pieces of PWGM flexible PDMS film, stacked face‐to‐face, form a piezoresistive sensor endowed with ultrahigh sensitivity across a very broad pressure range. The sensitivity of the device is as high as 383 665.9 and 269 662.9 kPa−1 in the pressure ranges 0–1.6 and 1.6–6 kPa, respectively. In the higher pressure range of 6.1–11 kPa, the sensitivity is 48 689.1 kPa−1, and even in the very high pressure range of 11–56 kPa, it stays at 1266.8 kPa−1. The pressure sensor possesses excellent bending and torsional strain detection properties, is mechanically durable, and has potential applications in wearable biosensing for healthcare. In addition, 2 × 2 and 4 × 4 sensor arrays are prepared and characterized, suggesting the possibility of manufacturing a flexible tactile sensor. [ABSTRACT FROM AUTHOR]

Highlights • We evaluated the effect of extended-gate filed-effect transistor (EGFET) sensors. • We used a dual gate structure transducer to overcome the theoretical Nernstian limit. • We found that the Ta 2 O 5 sensing membrane has the highest sensitivity of 478.0 mV/pH. Abstract Sensing properties of various high-k sensing membrane, such as SnO 2 , HfO 2 , ZrO 2 , and Ta 2 O 5 , in dual gate extended-gate field-effect transistor (EGFET) were investigated. By adapting the dual-gate structure, high sensitivity exceeding the conventional Nernstian limit on sensitivity (59.15 mV/pH at 25 °C) was realized due to capacitive coupling effect. As a results, it was confirmed that dual-gate EGFET with Ta 2 O 5 sensing membrane which has high permittivity shows the highest sensitivity of 478.0 mV/pH as well as excellent hysteresis voltage and drift rate characteristics. [ABSTRACT FROM AUTHOR]

• Composite of cobalt oxide nanorods (CoCo 2 O 4 NRs), and hexagonal boron nitride were prepared. • A new electrochemical sensor was reported based on CoCo 2 O 4 NRs/h-BN for antibiotic Ronidazole detection. • The CoCo 2 O 4 NRs/h-BN exhibits good electrocatalytic activity towards Ronidazole detection. • The constructed electrode owns a LOD (3 nM) and higher sensitivity (5.845 µA µM−1 cm−2). • The good recovery results were obtained for ronidazole determination in real sample analysis. The construction of highly sensitive electrochemical sensors is essential for the determination of pharmaceutical drugs. Because pharmaceutical drugs and their metabolites are significantly polluting the aqueous systems. Herein, we have developed a highly sensitive electrochemical sensor for the determination of veterinary antibiotic drug ronidazole (RNZ). The electrode has fabricated based on cobalt oxide nanorods integrated hexagonal boron nitride-modified glassy carbon electrode (CoCo 2 O 4 NRs/h-BN/GCE). The CoCo 2 O 4 nanorods were prepared by cetyl trimethyl ammonium bromide (CTAB) assisted hydrothermal method and the CoCo 2 O 4 NRs/h-BN composite was prepared using an ultra-sonication/stirring process. The as-prepared catalysts were confirmed by p-XRD, FT-IR, XPS, and FE-SEM analysis. The electrochemical performance of the catalyst was analyzed by using CV, and DPV techniques. CoCo 2 O 4 NRs/h-BN/GCE shows the highest electrocatalytic activity for the sensing of RNZ. Moreover, the nanocomposite shows lower LOD (3 nM) and highest sensitivity (5.845 µA µM−1 cm−2) for RNZ determination. [Display omitted] [ABSTRACT FROM AUTHOR]

We report a monolithically integrated optical receiver consisting of a silicon NMOS transimpedance preamplifier paired with a lateral, interdigitated p-i-n photodiode. The preamplifier achieved a bandwidth of 500 MHz, a transimpedance of 51.4 dB-Ω and dissipated only 10.8 mW of power at a power supply voltage of 1.8 V. At a bit-error rate of 10-9, the receiver exhibited sensitivities of -22.8, -15, and -9.3 dBm at bit rates of 622 Mb/s, 900 Mb/s, and 1 Gb/s, respectively. To the best of the authors' knowledge this is the highest sensitivity at 1 Gb/s reported for a silicon monolithically integrated optical receiver [ABSTRACT FROM PUBLISHER]