Article
Engineering, Electrical & Electronic
Qianqian Shao, Guoxin Yang, Jianxin Jia, Liuhong Ma, Mengke Li, Yinghui Zhong, Haibin Sun, Changhui Jiang, Yuwei Chen, Zhiyong Duan
Summary: A sensitivity enhanced touch mode capacitive pressure sensor with double cavities is proposed to improve pressure sensing ability. The double cavities and small gap structure reduce the influence of gas thermal expansion and slow air exchange, increasing sensor sensitivity. The plate touch capacitor effectively improves pressure detection sensitivity. Experimental and theoretical analysis show the volume ratio between top and bottom cavities significantly affects pressure sensitivity. The sensor's sensitivity in the working range is 1003210.27 ppm/kPa and the maximum hysteresis error is 0.15 pF.
MICROSYSTEM TECHNOLOGIES-MICRO-AND NANOSYSTEMS-INFORMATION STORAGE AND PROCESSING SYSTEMS
(2023)
Article
Chemistry, Analytical
Joaquim O. Carneiro, Artur Ribeiro, Filipe Miranda, Iran Rocha Segundo, Salmon Landi, Vasco Teixeira, Manuel F. M. Costa
Summary: This work describes the development of a capacitive-type sensor created from nanoporous anodic aluminium oxide, exploring the effects of pore size and porosity on sensing performance for humidity and biological touch applications. The study found that the sensitivity of the sensor fabricated in a phosphoric acid solution was significantly higher than those fabricated in oxalic and sulfuric acids, due to the pore size effect on water vapor molecules. Additionally, the NP-AAO structures were demonstrated to be effective as capacitive touch sensors for detecting bacteria based on the magnitude of capacitance change.
Article
Polymer Science
Qi Zhang, Fei-Yan Li, Xue Li, Xiao-Ting He, Jun-Yi Sun
Summary: This paper presents an analytical solution-based method for the design and numerical calibration of polymer conductive membrane-based circular capacitive pressure sensors. It introduces the design of touch mode circular capacitive pressure sensors using an analytical solution for the first time. The analytical relationship between input pressure and output capacitance is derived, and the influence of design parameters on input capacitance-output pressure relationships is investigated.
Article
Nanoscience & Nanotechnology
Hongwei Zhou, Mingcheng Wang, Xilang Jin, Hanbin Liu, Jialiang Lai, Haotian Du, Weixing Chen, Aijie Ma
Summary: By fabricating reliefs on PVA/PANI hydrogel electrodes, the GF of the pressure sensor is enhanced, and controlled by adjusting the composition and relief dimension. The optimized pressure sensor containing reliefs achieves the highest GF and has a sensing range of 0-7.4 kPa.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Engineering, Electrical & Electronic
MyongChol Kang, Chan Ri, JongHuan Choe
Summary: The paper introduces a design improvement for TMCPS capacitance response, validated through mathematical analysis and simulation, showing significant enhancement in sensitivity and linearity in touch mode. This provides a reference for designing TMCPS and predicting its behavior.
MICROELECTRONICS JOURNAL
(2021)
Article
Engineering, Electrical & Electronic
Ruiqing Li, Qun Zhou, Yin Bi, Shaojie Cao, Xue Xia, Aolin Yang, Siming Li, Xueliang Xiao
Summary: This paper reviews a large number of research outputs on sensitivity improvement of flexible capacitive pressure sensors and discusses methods and trends for enhancing the sensitivity of pressure sensors.
SENSORS AND ACTUATORS A-PHYSICAL
(2021)
Article
Engineering, Electrical & Electronic
Xueyang Liu, Chuanliang Li, Zhentao Wang, Yifeng Li, Jianqiu Huang, Huiyang Yu
Summary: This paper presents flexible pressure sensors based on 3D printing technology, with a sandwich structure design and a hollow prism structure pressure sensitive layer. Experimental synthesis of three kinds of flexible composite dielectrics demonstrated that the sensor with PDMS doping both BaTiO3 and CNTs showed the highest sensitivity, 1.3 times that of the reference sensor, indicating that fabricating composite dielectrics in this way has the potential to improve device performance.
IEEE SENSORS JOURNAL
(2021)
Article
Engineering, Electrical & Electronic
P. K. Sreekanth, Sumit Kumar Jindal
Summary: Differential capacitance diaphragm gauges are popular in pressure measurements due to their superior sensitivity and reduced nonlinearity. This analysis for modeling these gauges is important because of their numerous use cases.
IEEE SENSORS JOURNAL
(2023)
Article
Multidisciplinary Sciences
Mirza S. Sarwar, Ryusuke Ishizaki, Kieran Morton, Claire Preston, Tan Nguyen, Xu Fan, Bertille Dupont, Leanna Hogarth, Takahide Yoshiike, Ruixin Qiu, Yiting Wu, Shahriar Mirabbasi, John D. W. Madden
Summary: Soft sensors capable of differentiating shear and normal force can enhance machines' control in physical interactions with humans. The capacitive sensor, composed of patterned elastomer, distinguishes between normal force and shear using signal summation and differences. With low crosstalk and high sensitivity, this sensor shows potential for application in humanoid robotics.
SCIENTIFIC REPORTS
(2023)
Article
Nanoscience & Nanotechnology
Zebang Luo, Jing Chen, Zhengfang Zhu, Lin Li, Yi Su, Wei Tang, Olatunji Mumini Omisore, Lei Wang, Hui Li
Summary: Flexible pressure sensors are being increasingly studied for mimicking human skin to sense external pressure. Achieving fully biomimetic skins requires sensors with high resolution and high sensitivity, and a micropillar-PVDF dielectric layer has been successfully designed to meet these requirements. The sensor matrix based on the micropillar-PVDF film and electrode array has shown high resolution and sensitivity in detecting pressure distribution and mapping objects with various geometries.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Analytical
Soo-Wan Kim, Geum-Yoon Oh, Kang-In Lee, Young-Jin Yang, Jeong-Beom Ko, Young-Woo Kim, Young-Sun Hong
Summary: In this study, a highly sensitive and flexible capacitive pressure sensor with an aligned airgap structure was developed. The sensor exhibits a wide range of working pressures, quick response time, and is applicable in wearable electronic devices and medical assistive devices.
Article
Chemistry, Multidisciplinary
Ke Zhao, Jiemin Han, Yifei Ma, Zhaomin Tong, Jonghwan Suhr, Mei Wang, Liantuan Xiao, Suotang Jia, Xuyuan Chen
Summary: In this study, a flexible capacitive pressure sensor with high sensitivity was fabricated using three-dimensional vertical graphene as the electrode and micro-pyramidal polydimethylsiloxane as the dielectric layer. Engineering the morphology, size, and interval of the micro-pyramids in the dielectric layer significantly boosted the sensor sensitivity. Finite element analysis revealed that the micro-pyramid structure in the dielectric layer generated a significant deformation effect under pressure, thereby improving the sensing properties. The sensor showed great potential in various applications, including human motion detection and human-machine interaction.
Article
Polymer Science
Xueqiang Tan, Jimin Zheng
Summary: A highly sensitive and flexible capacitive pressure sensor was developed by sandwiching a porous PAP sponge dielectric layer between two copper electrodes. The sensor showed excellent performance, including high sensitivity, waterproofing, high elasticity, and low density, making it suitable for various applications in the field of wearable electronics.
Article
Chemistry, Physical
Guru Aathavan Alagu Uthaya Kumar, Sumit Kumar Jindal, P. K. Sreekanth
Summary: This study proposes a design that introduces a notch in the concave substrate to improve the sensitivity of the capacitive pressure sensor. Through mathematical analysis and software simulations, it is concluded that the proposed design has high sensitivity and a higher pressure saturation value.
Article
Computer Science, Information Systems
Muhammad Qasim Mehmood, Muhammad Hamza Zulfiqar, Amit Kumar Goyal, Muhammad Shumail Malik, Wasif Tanveer Khan, Muhammad Atif Khan, Muhammad Zubair, Yehia Massoud
Summary: This study presents a fabrication process for interdigitated capacitive (IDC) sensors that can detect different pressure levels of finger touch. The sensors can be used to develop multimode human-machine interfaces (HMIs) for various applications, such as mouse cursor control, numeric keyboard, and smart door locking system. The presented HMIs have the potential to contribute to future developments in intelligent user interfaces, computer peripherals, security applications, ATMs, and smart home systems.