期刊
SMALL
卷 17, 期 8, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.202007593
关键词
gold nanoparticles; human-health monitoring; molecular spring; strain sensors
类别
资金
- Agence Nationale de la Recherche through the FLAG-ERA project PROSPECT [ANR-19-GRF1-0005-02]
- Labex project CSC within the Investissement d'Avenir program [ANR-10-LABX-0026 CSC, ANR-10-120 IDEX-0002-02]
- Labex project NIE within the Investissement d'Avenir program [ANR-10-120 IDEX-0002-02, ANR-11-LABX-0058 NIE]
- International Center for Frontier Research in Chemistry (icFRC)
- Institut Universitaire de France (IUF)
- Ernest Solvay Fund
- Agence Nationale de la Recherche (ANR) [ANR-19-GRF1-0005] Funding Source: Agence Nationale de la Recherche (ANR)
A novel strain sensor based on gold nanoparticles and flexible molecular linkers has been developed, exhibiting high sensitivity, superior performance, and robustness, suitable for health monitoring and extraction of important physiological parameters.
High-performance flexible strain sensors are key components for the next generation of wearable health monitoring devices. Here, the authors have fabricated a novel strain sensor based on gold nanoparticles (AuNPs) interconnected by flexible and responsive molecular linkers. The combination of conductive AuNPs (25 nm in diameter) with tetra(ethylene glycol) dithiol (SH-TEG-SH) linkers yields a covalent 3D network which can be directly deposited onto prepatterned flexible supports exposing interdigitated Au electrodes. The electrically insulating nature of the linkers effectively defines the tunneling modulated charge transfer through the AuNPs network. When compressive/tensile strain is applied, the molecular linkers adopt a compressed/stretched conformation thus decreasing/increasing the interparticle distance, ultimately yielding an exponential increase/decrease of the tunneling current when voltage is applied. The strain sensor displays state-of-the-art performances including a highly sensitive response to both tensile and compressive strain, as quantified by a high gauge factor (GF approximate to 126) combined with other superior sensing properties like high flexibility, short response time (16.1 ms), and good robustness (>2000 cycles). Finally, the applicability of the device for health monitoring is demonstrated: high-resolution artery pulse waves are acquired by placing the strain sensor onto the skin allowing the extraction of important physical parameters for human-health assessment.
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