14November2019

Nano-Micro Letters

Direct Patterning of Carbon Nanotube via Stamp Contact Printing Process for Stretchable and Sensitive Sensing devices

Binghao Liang1, Zian Zhang1, Wenjun Chen1, Dongwei Lu1, Leilei Yang1, Rongliang Yang1, Hai Zhu2, Zikang Tang3, Xuchun Gui1, *

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Nano-Micro Lett. (2019) 11: 92

First Online: 23 October 2019 (Article)

DOI:10.1007/s40820-019-0323-8

*Corresponding author. E-mail: guixch@mail.sysu.edu.cn (Xuchun Gui)

 

Abstract

 


Toc

Flexible and wearable sensing devices have broad application prospects in bio-monitoring such as pulse measurement, motion detection, and voice recognition. In recent years, many significant improvements had been made to enhance the sensor's performance including sensitivity, flexibility, and repeatability. However, it is still extremely complicated and difficult to prepare a patterned sensor directly on a flexible substrate. Herein, inspired by typography, a low-cost, environmentally friendly stamping method for the mass production of transparent conductive carbon nanotube (CNT) film is proposed. In this dry transfer strategy, a porous CNT block was used as both the seal and the ink; and Ecoflex film was served as an object substrate. Well-designed CNT patterns can be easily fabricated on the polymer substrate by engraving the target pattern on the CNT seal before the stamping process. Moreover, the CNT film can be directly used to fabricate ultrathin (300 μm) strain sensor. This strain sensor possesses high sensitivity with a gauge factor (GF) up to 9,960 at 85% strain, high stretchability (>200%) and repeatability (>5000 cycles). It has been used to measure pulse signal and detect joint motion, suggesting promising application prospects in flexible and wearable electronic devices.


 

Keywords

Carbon Nanotube; Strain Sensor; Dry Transfer; Stamp contact printing process

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