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                                        Lu Research Group                                        Mechanics and Materials of Bio-Integrated Electronics
                                        

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A Chest-Laminated Ultrathin and Stretchable E-Tattoo

A Chest-Laminated Ultrathin and Stretchable E...

"Our recent paper "T. Ha, J. Tran, S. Liu, H. Jang, H. Jeong, R. Mitbander, H. Huh, Y. Qiu, J. Duang, R. Wang, P. Wang, A. Tandon, J. Sirohi, N. S. Lu*, “A Chest-Laminated Ultrathin and Stretchable E-Tattoo for the Measurement of Electrocardiogram, Seismocardiogram, and Cardiac Time Intervals”, Advanced Science, 1900290, May 2019. https://doi.org/10.1002/advs.201900290" is selected as the front cover of Advanced Science. We built a noninvasive e-tattoo capable of synchronous electrocardiogram (ECG) and seismocardiogram (SCG) sensing, which can also be used for beat-to-beat blood pressure (BP) inference. 3D digital image correlation (3D DIC) was used to map chest vibration due to heart beat, which is useful to determine the best location to laminate the e-tattoo."

Graphene electronic tattoo (GET)

Graphene electronic tattoo (GET)

Graphene electronic tattoo (GET) is a group of ultrathin stretchable dry sensors for measuring electrocardiogram (ECG), electromyogram (EMG), electroencephalogram (EEG), skin temperature, and skin hydration. Because of low thickness (463 ± 30 nm) and ultra low areal mass density of GET, it forms conformal contact to the skin and stays intact without any adhesive or tape just via van der Waals force. A bare GET is able to stay attached to skin for several hours without fracture or delamination. With liquid bandage coverage, a GET may stay functional on the skin for up to several days. The optical transparency of GET is ∼85%, and it is more stretchable (40%) than human skin (10 to 30%). The GET can be directly laminated on human skin just like a temporary tattoo and can ...

"Cut-and-Paste" Manufacture of Multiparametric Epidermal Sensor Systems

"Cut-and-Paste" Manufacture of Multiparametri...

We report a cost and time effective, completely dry, benchtop “cut-and-paste” method for the freeform and portable manufacture of multiparametric epidermal sensor systems (ESS) within minutes. This versatile method works for all types of thin metal and polymeric sheets and is compatible with any tattoo adhesives or medical tapes. The resulting ESS are multimaterial and multifunctional and have been demonstrated to noninvasively but accurately measure electrophysiological signals, skin temperature, skin hydration, as well as respiratory rate. In addition, planar stretchable coils exploiting double-stranded serpentine design have been successfully applied as wireless, passive epidermal strain sensors.

Epidermal Electronics

Epidermal Electronics

Electronic tattoos with thickness, effective elastic modulus, bending stiffness, and areal mass density matched to the epidermis have been developed. Laminating such devices onto the skin leads to conformal contact and adequate adhesion in a manner that is mechanically invisible to the user. Such devices have been demonstrated for noninvasive monitoring of EEG, EKG and EMG. It also represents a platform technology for potential incorporation of temperature sensors, strain gauges, LED, solar cells, antennas and so on. Watch the Video Download Full Article (PDF)

Multifunctional Balloon Catheter

Multifunctional Balloon Catheter

Multifunctional Balloon Catheter Materials that integrate directly with the thin elastic membranes of otherwise conventional balloon catheters can provide diverse, multimodal functionality suitable for clinical use. As examples, we present sensors for measuring temperature, flow, tactile, optical and electrophysiological data, together with radiofrequency electrodes for controlled, local ablation of tissue. Use of such 'instrumented' balloon catheters in live animal models illustrates their operation, as well as their specific utility in cardiac ablation therapy. Download Full Article (PDF)

Research

Bio-Integrated Electronics
71. Shideh Kabiri Ameri, Myungsoo Kim,Irene Agnes Kuang, Withanage K. Perera, Mohammed...

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Bio-Electronics Interface
62. Shutao Qiao, Liu Wang, Hyoyoung Jeong, Gregory J. Rodin*, Nanshu Lu*, Suction effects of...

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Stretchability
54. Shixuan Yang, Shutao Qiao, Nanshu Lu*, Elasticity Solutions to Nonbuckling Serpentine...

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Flexibility & Flexible Devices
64. Moon Kee Choi, Jiwoong Yang, Dong Chan Kim, Zhaohe Dai, Junhee Kim, Hyojin Seung, Vinayak S....

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2D Materials and Devices
70. Daniel A. Sanchez, Zhaohe Dai, Peng Wang, Arturo Cantu-Chavez, Christopher J. Brennan, Rui Huang*,...

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Publications

88. Wenda Zhao, Shaolan Li, Biying Xu, Xiangxing Yang, Xiyuan Tang, Linxiao Shen, Nanshu Lu, David Z. Pan and Nan Sun*. A 0.025-mm² 0.8-V 78.5-dB SNDR VCO-Based Sensor Readout Circuit in a Hybrid PLL-ΔΣM Structure. IEEE Journal of Solid-state Circuits 55, 3 (2020).

87. Christopher J. Brennan, Kalhan Koul, Nanshu Lu*, Edward Yu*. Out-of-plane electromechanical coupling in transition metal dichalcogenides. Applied Physics Letters 116, 053101 (2020).

86. Zhaohe Dai, Daniel A. Sanchez, Christopher J. Brennan, Nanshu Lu*. Radial Buckle Delamination around 2D Material Tents. Journal of the Mechanics and Physics of Solids 137, 103843 (2020).

85. Hongwoo Jang, Zhaohe Dai, Kyoung-Ho Ha, Shideh Kabiri Ameri, and Nanshu Lu*. Stretchability of PMMA-supported CVD graphene and of its electrical contacts. 2D Materials 7, 014003 (2020).

Read more: 2020

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