![]() ![]() This strategy allows to achieve stretchable electrodes, but strongly affects the conductivity of the transferred layer reducing its available surface area. For this reason, some research groups proposed the transfer of a LIG layer produced onto polyimide onto PDMS by simple infiltration of the uncured elastomer into the LIG network and subsequent peeling after the PDMS cross-linking. Unfortunately, it cannot be easily graphenized by direct laser writing because of the low amount of carbon linked to the siloxane chains, mainly consisting of methyl groups. Moreover, it is a cost-effective material and allows the development of reliable mass replication technique. Indeed, up to now the evidence of graphenization of elastomeric substrate has never been observed.Ĭonsidering the family of elastomer polymers, polydimethylsiloxane (PDMS) represents the most popular elastomeric material in microsystem technology thanks to its attractive physical and chemical properties such as elasticity, optical transparency down to 220 nm, tunable surface chemistry, low water permeability but high gas permeability and high dielectric properties. However, despite the endless efforts spent to develop LIG on new substrates there is a lack of stretchable polymers suitable for laser graphenization. In this context, laser induced graphene is emerging, in the large family of graphene-based materials, as one of the most promising materials for the fabrication of flexible electronic devices. This implies that it is not possible to keep flexibility and stretchability separated. Pdms sample project work portable#Moreover, even if the flexibility is mandatory, stretchable substrates are even more desired since the portable device sector is moving toward a wearable configuration. Among the main limitations, it is possible to observe that there is an urgency of effective strategies to obtain conductive paths onto flexible substrates. Pdms sample project work full#However, the way to reach the target of totally flexible devices is still long and full of obstacles that strongly obstruct the development of such systems. Moreover, all of them must be conformable to curved and complex surfaces. Indeed the emerging field of Internet of Things needs hardware supports and not only data connection and analysis. This is the key concept emerging from the last decade literature related to sensors, energy devices and antennas, i.e., the three main components of a portable electronic system. The future of portable electronics will surely be flexible. ![]() The PDMS-TEG material becomes a suitable candidate for flexible microsupercapacitor fabrication with specific capacitance values as high as 287 ♟ cm −2 and energy and power density approaching LIG-based supercapacitors fabricated onto traditional polyimide substrates. ![]() Nevertheless, by adding triethylene glycol (TEG) as carbon source into the PDMS matrix, it is possible to improve the graphenization and to reduce the sheet resistance of the written LIG by two orders of magnitude down to 130 ohm sq −1. The low carbon content and the absence of aromatic structures strongly limit the graphenization process resulting in limited conduction properties. Herein, the laser graphenization of polydimethylsiloxane (PDMS), the most exploited elastomeric substrate for flexible electronic device fabrication, is proposed for the first time. Unfortunately, despite the large number of materials suitable for laser-induced graphene (LIG) fabrication, there is a lack of stretchable polymers, hindering the full exploitation of LIG for flexible electronics. Laser graphenization of polymeric surfaces has emerged as one of the most promising technologies to fabricate flexible electrodes. ![]()
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