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Direct printing of performance tunable strain sensor via nanoparticle laser patterning process
摘要： Flexible electronics are attractive because of flexibility and portability. The circuits are printed on flexible substrates, which are delicate and heat-sensitive. Traditional photolithography, which uses high temperatures and corrosive chemicals, easily causes damages in flexible substrates. Here, we develop a low-cost nanoparticle based laser patterning process for fabrication of flexible electronics. Nanoparticles are sintered using a low-power laser as they are selectively deposited. Copper and silver particles were successfully deposited on paper and polyethylene terephthalate substrates. The effects of process parameters on deposition performance were studied to understand the process-structure–property relationship. The thermal effects of the laser on film morphology were observed. The sensitivities of the electrical properties with respect to the porosities at different laser power densities were analysed. With different laser energy levels, the process allows for selective deposition, properties control of printed patterns, and flexible substrate cutting. The fabrications of strain sensor and kirigami electronics were demonstrated.
关键词： strain sensor,electrical properties,hybrid manufacturing,Nanoparticle deposition,flexible electronics,process-structure–property relationship
更新于2025-09-23 15:19:57
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Probing the Deposition Kinetics of Nanoparticles by Plasmonic Imaging and Counting Single Nanoparticles
摘要： Understanding the nanoparticle deposition process is important for predicting the transport and fate of nanoparticles in natural and engineered aquatic environments. Traditional methods for deposition studies are based on ensemble analysis of nanoparticles. Here, a single nanoparticle imaging method was used to probe the deposition kinetics of nanoparticles by directly counting single nanoparticles with powerful surface plasmon resonance microscopy (SPRM). The ability of SPRM to provide single nanoparticle imaging and its vertical sensitivity enabled us to differentiate collision and attachment events and, consequently, determine the attachment efficiency without any additional control experiments. As a proof-of-concept application of SPRM in measuring nanoparticle deposition, the relationship of the solution chemistry and surface chemistry with the attachment efficiency of nanoparticles was correlated. These results demonstrated that nanoparticle deposition kinetics at the single-particle level can be obtained with SPRM and that this technology can also be used to investigate other particle-particle or particle-surface interactions in aquatic environments.
关键词： surface plasmon resonance microscopy,single nanoparticle imaging,surface chemistry,attachment efficiency,nanoparticle deposition,solution chemistry
更新于2025-09-19 17:13:59