Transfer printing technologies for soft electronics

Huang, Zhenlong; Lin, Yuan

doi:10.1039/d2nr04283e

Cited by 12 publications

(5 citation statements)

References 119 publications

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“…These properties are difficult to alter during the transfer printing process. [49,72] Therefore, the critical point of the transfer printing process is to regulate the stamp/ink interface adhesion strength to switch between strong and weak states.…”

Section: Fundamental Features Of Transfer Printing Systemsmentioning

confidence: 99%

Regulatable interfacial adhesion between stamp and ink for transfer printing

Li,

Zhang,

Wang

2024

Interdisciplinary Materials

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As an emerging processing technology, transfer printing enables the assembly of functional material arrays (called inks) on various substrates with micro/nanoscale resolution and has been widely used in the fabrication of flexible electronics and display systems. The critical steps in transfer printing are the ink pick‐up and printing processes governed by the switching of adhesion states at the stamp/ink interface. In this review, we first introduce the history of transfer printing in terms of the transfer methods, transferred materials, and applications. Then, the fundamental characteristics of the transfer printing system and typical strategies for regulating the stamp/ink interfacial adhesion strength are summarized and exemplified. Finally, future challenges and opportunities for developing the novel stamps, inks, and substrates with intelligent adhesion capability are discussed, aiming to inspire the innovation in the design of transfer printing systems.

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Section: Fundamental Features Of Transfer Printing Systemsmentioning

confidence: 99%

Regulatable interfacial adhesion between stamp and ink for transfer printing

Li,

Zhang,

Wang

2024

Interdisciplinary Materials

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“…Successful transfer also relies on the viscoelasticity of the stamp and the peeling rate. 68,285 PDMS has been utilized to pick up devices from silicon wafers and transfer them to the skin. 29 However, elastomer-based transfer printing faces challenges with largearea e-tattoos due to the nondevelopable shape of human skin.…”

Section: Transfer Printingmentioning

confidence: 99%

“…To transfer e-tattoos to the skin, the adhesion force between the stamp and the e-tattoos must be stronger than that between the device and the handling substrate but weaker than that between the device and the skin. Successful transfer also relies on the viscoelasticity of the stamp and the peeling rate. , PDMS has been utilized to pick up devices from silicon wafers and transfer them to the skin . However, elastomer-based transfer printing faces challenges with large-area e-tattoos due to the nondevelopable shape of human skin .…”

Section: Materials Design Manufacture and Transferring Technologies O...mentioning

confidence: 99%

E-Tattoos: Toward Functional but Imperceptible Interfacing with Human Skin

Li,

Tan,

Rao

et al. 2024

Chem. Rev.

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The human body continuously emits physiological and psychological information from head to toe. Wearable electronics capable of noninvasively and accurately digitizing this information without compromising user comfort or mobility have the potential to revolutionize telemedicine, mobile health, and both human−machine or human−metaverse interactions. However, state-of-the-art wearable electronics face limitations regarding wearability and functionality due to the mechanical incompatibility between conventional rigid, planar electronics and soft, curvy human skin surfaces. E-Tattoos, a unique type of wearable electronics, are defined by their ultrathin and skin-soft characteristics, which enable noninvasive and comfortable lamination on human skin surfaces without causing obstruction or even mechanical perception. This review article offers an exhaustive exploration of e-tattoos, accounting for their materials, structures, manufacturing processes, properties, functionalities, applications, and remaining challenges. We begin by summarizing the properties of human skin and their effects on signal transmission across the e-tattoo-skin interface. Following this is a discussion of the materials, structural designs, manufacturing, and skin attachment processes of e-tattoos. We classify e-tattoo functionalities into electrical, mechanical, optical, thermal, and chemical sensing, as well as wound healing and other treatments. After discussing energy harvesting and storage capabilities, we outline strategies for the system integration of wireless e-tattoos. In the end, we offer personal perspectives on the remaining challenges and future opportunities in the field.

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“…[ 169 ] The engineering route for pre‐strained techniques typically starts with the fabrication of functional devices on a rigid substrate, followed by a stamping step to transfer the device from the rigid substrate to the pre‐strained soft substrate. [ 172 ] The film will finally undergo out‐of‐plane deformations upon stress release. Harnessed by Chang et al., [ 93 ] a crumple‐wrinkle film architecture with high strain‐insensitive stretchability was realized (Figure 11b).…”

Section: Fabrication Technologies For Integrated Sensorsmentioning

confidence: 99%

Integrated Sensors for Soft Medical Robotics

Qiu,

Ashok,

Nguyen

et al. 2024

Small

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Minimally invasive procedures assisted by soft robots for surgery, diagnostics, and drug delivery have unprecedented benefits over traditional solutions from both patient and surgeon perspectives. However, the translation of such technology into commercialization remains challenging. The lack of perception abilities is one of the obstructive factors paramount for a safe, accurate and efficient robot‐assisted intervention. Integrating different types of miniature sensors onto robotic end‐effectors is a promising trend to compensate for the perceptual deficiencies in soft robots. For example, haptic feedback with force sensors helps surgeons to control the interaction force at the tool‐tissue interface, impedance sensing of tissue electrical properties can be used for tumor detection. The last decade has witnessed significant progress in the development of multimodal sensors built on the advancement in engineering, material science and scalable micromachining technologies. This review article provides a snapshot on common types of integrated sensors for soft medical robots. It covers various sensing mechanisms, examples for practical and clinical applications, standard manufacturing processes, as well as insights on emerging engineering routes for the fabrication of novel and high‐performing sensing devices.

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Transfer printing technologies for soft electronics

Abstract: Soft electronics have received increasing attention in recent years, owing to their wide-ranging applications in dynamic nonplanar surface integration electronics that include skin electronics, implantable devices, and soft robotics. Transfer...

Cited by 12 publications

References 119 publications

Regulatable interfacial adhesion between stamp and ink for transfer printing

Regulatable interfacial adhesion between stamp and ink for transfer printing

E-Tattoos: Toward Functional but Imperceptible Interfacing with Human Skin

Integrated Sensors for Soft Medical Robotics

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