Integrated temperature and pressure dual-mode sensors based on elastic PDMS foams decorated with thermoelectric PEDOT:PSS and carbon nanotubes for human energy harvesting and electronic-skin

Gao, Fu‐Lin; Peng, Min; Gao, Xuan‐Zhi; Li, Changjun; Zhang, Tingting; Yu, Zhong‐Zhen; Li, Xiaofeng

doi:10.1039/d2ta04862k

Cited by 66 publications

(48 citation statements)

References 65 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, the impact of such small changes on the overall performance of the device is negligible; thus the sensor maintain a favorable repeatability over a long period of time. Besides the cycling stability, frequency-independent stability is also crucial for piezoresistive pressure sensors, , we tested the frequency-independent stability of the sensor, and the results are shown in Figure S3. Figure h displays the comparison between the prepared MWCNT-PDMS/SP pressure sensor and several similar research studies, − where the ordinate represents the sensor sensitivity, and the abscissa represents the effective sensing range of the sensor.…”

Section: Resultsmentioning

confidence: 99%

Flexible Multimodal Sensors Based on Fibrous Porous Networks of Multiwalled Carbon Nanotubes and Polydimethylsiloxane for Sensing and Distinguishing Vertical and Shear Force

Qin

Gao

Chen

et al. 2023

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

Wearable sensors are one of the key components in applications such as motion monitoring, smart medical care, and human-computer interaction systems. In the present work, we focus on the simultaneous improvements of flexible sensors in both performance and functionality. Here, with a porous fiber network of multi-walled carbon nanotubes (MWCNTs)−polydimethylsiloxane (PDMS) as an active layer, a flexible pressure sensor with ultra-high sensitivity and superior capability of identifying transverse shear force and temperature signals is designed and constructed. The fibral MWCNTs−PDMS piezoresistive layer was formed with a scouring pad (SP) fiber network as skeleton, and the PDMS thin layer formed by self-assembly can effectively increase the initial resistance. Attributing to the unique compressibility of the fibral porous network and the adjustable nanoscale contacts, the MWCNT-PDMS/SP sensor exhibits a wide detection range (0−360 kPa), and in particular, an ultra-high sensitivity (84,818.2 kPa −1 when <100 pa). Beyond the highly sensitive characteristics, the sensor also has a high shear-force sensitivity (GF = 6.15 under 0.05 N). The sensor can still maintain a relatively stable performance even after operating for more than 10,000 pressure cycles, showing as a potential candidate for the applications of electronic skin, intelligent robots, etc.

show abstract

Section: Resultsmentioning

confidence: 99%

Flexible Multimodal Sensors Based on Fibrous Porous Networks of Multiwalled Carbon Nanotubes and Polydimethylsiloxane for Sensing and Distinguishing Vertical and Shear Force

Qin

Gao

Chen

et al. 2023

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

show abstract

“…Environmental sensors and haptic e-skins are applied by monitoring external temperature changes and collecting physiological signals from living beings. Gao and co-workers designed a multifunctional dual-mode pressure sensor array based on PEDOT:PSS/CNT@PDA@PDMS foam to be fabricated [ 142 ]. Since this e-skin has independent temperature and pressure sensing capabilities, it can generate stable voltage using the temperature difference between human skin and the surrounding environment as a self-powered wearable e-skin system.…”

Section: Application Of Conjugated Polymer Nanocomposite Based Pressu...mentioning

confidence: 99%

“…( e – g ) Photographs of a cup of hot water and a cup of cold water and a finger touching the touch e-skin and the corresponding temperature and pressure response graphs are placed, respectively. Reproduced with permission [ 142 ]. Copyright 2022, The Royal Society of Chemistry.…”

Section: Figurementioning

confidence: 99%

Conjugated Polymer-Based Nanocomposites for Pressure Sensors

et al. 2023

View full text Add to dashboard Cite

Flexible sensors are the essential foundations of pressure sensing, microcomputer sensing systems, and wearable devices. The flexible tactile sensor can sense stimuli by converting external forces into electrical signals. The electrical signals are transmitted to a computer processing system for analysis, realizing real-time health monitoring and human motion detection. According to the working mechanism, tactile sensors are mainly divided into four types—piezoresistive, capacitive, piezoelectric, and triboelectric tactile sensors. Conventional silicon-based tactile sensors are often inadequate for flexible electronics due to their limited mechanical flexibility. In comparison, polymeric nanocomposites are flexible and stretchable, which makes them excellent candidates for flexible and wearable tactile sensors. Among the promising polymers, conjugated polymers (CPs), due to their unique chemical structures and electronic properties that contribute to their high electrical and mechanical conductivity, show great potential for flexible sensors and wearable devices. In this paper, we first introduce the parameters of pressure sensors. Then, we describe the operating principles of resistive, capacitive, piezoelectric, and triboelectric sensors, and review the pressure sensors based on conjugated polymer nanocomposites that were reported in recent years. After that, we introduce the performance characteristics of flexible sensors, regarding their applications in healthcare, human motion monitoring, electronic skin, wearable devices, and artificial intelligence. In addition, we summarize and compare the performances of conjugated polymer nanocomposite-based pressure sensors that were reported in recent years. Finally, we summarize the challenges and future directions of conjugated polymer nanocomposite-based sensors.

show abstract

“…Pressure sensors have attracted much attention because of their good application prospects in biomedical, consumer electronics, human–computer interaction, aerospace, and other fields. − Although the traditional pressure sensor represented by the transistor type shows high sensitivity and a wide range of practical applications, it has great limitations in use because of its rigid substrate, which is usually incompatible with the flexible substrate or device. , A flexible pressure sensor provides a new opportunity and development path to solve the above problems. − In addition, it provides a reliable reference for multiple sensing based on pressure measurement. − …”

Section: Introductionmentioning

confidence: 99%

Pressure Sensors Combining Porous Electrodes and Electrospun Nanofiber-Based Ionic Membranes

Fan

Yang

Sun

2023

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

It is one of the most urgent development directions and crucial challenges for flexible pressure sensors to have both characteristics of high sensitivity and wide measuring range. To address this challenging problem, this paper proposes an innovative, convenient, and industrially scalable capacitive pressure sensor that combines porous electrodes and electrospun nano ionic membranes with surface microstructure. The advantage of this sensor is that nano ionic nanofiber membranes are directly prepared on porous conductive fabrics by electrospinning with high reliability and good repeatability. The prepared dielectric layer of the sensor is in complete contact with the electrode, which effectively eliminates the uncertainty of air gap interference in traditional packaging methods. The sensing mechanism of the designed sensor is also persuasively revealed by finite-element and theoretical analysis in this paper. First, the porosity of both the conductive fabric and dielectric layer expands the measurement range. Second, the surface microstructure of the nano ion membrane increases the effective contact area between the dielectric layers when external pressure is applied to the sensor, thus increasing the conduction path of the ions. The increase of the ionizing degree under pressure leads to the change of the interface capacitance. These make the sensor have high sensitivity in the wide measurement range. The designed sensor exhibits a sensitivity of up to 1254.5 kPa −1 over a low-pressure measurement range of 0−10 kPa, providing an amazingly wide measurement range of 0−800 kPa, with an extremely high sensitivity of 128.1 kPa −1 over the entire measurement range. The designed sensor illustrates both a fairly fast response time of 10 ms and a relaxation time of 16 ms, in addition to the durability of up to 3000 cycles. The above exceptional performance demonstrates its remarkable potential applications in smart wearable devices and pneumatic pressure monitoring.

show abstract

Integrated temperature and pressure dual-mode sensors based on elastic PDMS foams decorated with thermoelectric PEDOT:PSS and carbon nanotubes for human energy harvesting and electronic-skin

Abstract: Conventional temperature-pressure bifunctional sensors based on thermoresistive and piezoresistive effects could not meet the growing demands for detecting multi-signals due to their intractable signal-coupling problems. It is imperative to develop...

Cited by 66 publications

References 65 publications

Flexible Multimodal Sensors Based on Fibrous Porous Networks of Multiwalled Carbon Nanotubes and Polydimethylsiloxane for Sensing and Distinguishing Vertical and Shear Force

Flexible Multimodal Sensors Based on Fibrous Porous Networks of Multiwalled Carbon Nanotubes and Polydimethylsiloxane for Sensing and Distinguishing Vertical and Shear Force

Conjugated Polymer-Based Nanocomposites for Pressure Sensors

Pressure Sensors Combining Porous Electrodes and Electrospun Nanofiber-Based Ionic Membranes

Contact Info

Product

Resources

About