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Open AccessArticle

A Light/Pressure Bifunctional Electronic Skin Based on a Bilayer Structure of PEDOT:PSS-Coated Cellulose Paper/CsPbBr₃ QDs Film

by Wenhao Li, Jingyu Jia, Xiaochen Sun, Sue Hao and Tengling Ye

Polymers 2023, 15(9), 2136; https://doi.org/10.3390/polym15092136 - 29 Apr 2023

Cited by 5 | Viewed by 2147

Abstract

With the continuous development of electronic skin (e-skin), multifunctional e-skin is approaching, and in some cases even surpassing, the capabilities of real human skin, which has garnered increasing attention. Especially, if e-skin processes eye’s function, it will endow e-skins more powerful advantages, such as the vision reparation, enhanced security, improved adaptability and enhanced interactivity. Here, we first study the photodetector based on CsPbBr₃ quantum dots film and the pressure sensor based on PEDOT: PSS-coated cellulose paper, respectively. On the base of these two kinds of sensors, a light/pressure bifunctional sensor was successfully fabricated. Finally, flexible bifunctional sensors were obtained by using a flexible interdigital electrode. They can simultaneously detect light and pressure stimulation. As e-skin, a high photosensitivity with a switching ratio of 168 under 405 nm light at a power of 40 mW/cm² was obtained and they can also monitor human motions in the meantime. Our work showed that the strategy to introduce perovskite photodetectors into e-skins is feasible and may open a new way for the development of flexible multi-functional e-skin. Full article

(This article belongs to the Special Issue Polymers/Their Hybrid Materials for Optoelectronic Applications)

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27 pages, 1149 KiB

Open AccessArticle

Soft, Transparent, Electronic Skin for Distributed and Multiple Pressure Sensing

by Alessandro Levi, Matteo Piovanelli, Silvano Furlan, Barbara Mazzolai and Lucia Beccai

Sensors 2013, 13(5), 6578-6604; https://doi.org/10.3390/s130506578 - 17 May 2013

Cited by 49 | Viewed by 11402

Abstract

In this paper we present a new optical, flexible pressure sensor that can be applied as smart skin to a robot or to consumer electronic devices. We describe a mechano-optical transduction principle that can allow the encoding of information related to an externally applied mechanical stimulus, e.g., contact, pressure and shape of contact. The physical embodiment that we present in this work is an electronic skin consisting of eight infrared emitters and eight photo-detectors coupled together and embedded in a planar PDMS waveguide of 5.5 cm diameter. When a contact occurs on the sensing area, the optical signals reaching the peripheral detectors experience a loss because of the Frustrated Total Internal Reflection and deformation of the material. The light signal is converted to electrical signal through an electronic system and a reconstruction algorithm running on a computer reconstructs the pressure map. Pilot experiments are performed to validate the tactile sensing principle by applying external pressures up to 160 kPa. Moreover, the capabilities of the electronic skin to detect contact pressure at multiple subsequent positions, as well as its function on curved surfaces, are validated. A weight sensitivity of 0.193 gr⁻¹ was recorded, thus making the electronic skin suitable to detect pressures in the order of few grams. Full article

(This article belongs to the Special Issue Optomechatronics)

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