期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 332, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2021.129520
关键词
electrospun; fiber; actuator; metal-organic framework
资金
- National Research Foundation of Korea (NRF) - Korea government (MSIT) [2020R1A2C3010568]
- Korea Environment Industry & Technology Institute (KEITI) through its Ecological Imitation-based Environmental Pollution Management Technology Development Project
- Korea Ministry of Environment (MOE) [2019002790003]
- Animal Disease Management Technology Development Program
- Korea Institute of Planning and Evaluation for Technology in Food, Agriculture and Forestry (IPET) [118094-03]
- Korea Health Technology R&D Project through the Korea Health Industry Development Institute (KHIDI)
- Ministry of Health & Welfare, Republic of Korea [HI20C0629]
- National Research Foundation of Korea [2020R1A2C3010568, 4199990313853] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
A humidity-responsive bilayer actuator was fabricated using the electrospinning method, with adjustments made to fiber alignment and the addition of MOF nanoparticles to enhance sensitivity. The addition of MOF nanoparticles resulted in a highly sensitive actuator with greater curvature changes and a higher actuating force.
A humidity-responsive bilayer actuator was fabricated using the electrospinning method. We fabricated a polyvinylpyrrolidone (PVP)/poly(acrylic acid) (PAA) active layer with different alignments of fibers and thicknesses, and combined them with polyimide film. We observed the bending motion of the actuator while the relative humidity varied from 10% to 80%. While the PVP/PAA layer was electrospun with an increase in collecting speed and time, the degree of fiber alignment and the film thickness increased, respectively. We observed that a well-aligned or thick actuator exhibited a higher change in curvature throughout the experiment. However, a thick actuator had low sensitivity to relative humidity changes because of the low diffusion rate. To overcome this drawback, we added metal-organic framework (MOF) nanoparticles to the PVP/PAA solution before electrospinning to enhance the sensitivity of the actuator. As a result, the MOF-actuator was highly sensitive to humidity and showed larger curvature changes, generating a high actuating force of approximately 5.5 mN at the same thickness as the bare PVP/PAA actuator. We believe that the introduced actuator can be applied in robotics, energy harvesting, and sensors with controllable performance and high actuating force.
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