Micro-spring force sensors using conductive photosensitive resin fabricated via two-photon polymerization
Bibliographic record
Abstract
The rapid miniaturization of electronic devices has fueled unprecedented demand for flexible, high-performance sensors across fields ranging from medical devices to robotics. Despite advances in fabrication techniques, the development of micro- and nano-scale flexible force sensors with superior sensitivity, stability, and biocompatibility remains a formidable challenge. In this study, we developed a novel conductive photosensitive resin specifically designed for two-photon polymerization, systematically optimized its printing parameters, and improved its structural design, thereby enabling the fabrication of high-precision micro-spring force sensors (MSFS). The proposed photosensitive resin, doped with MXene nanomaterials, combines exceptional mechanical strength and conductivity, overcoming limitations of traditional materials. Using a support vector machine model in machine learning techniques, we optimized the polymerizability of the resin under varied laser parameters, achieving a predictive accuracy of 92.66%. This model significantly reduced trial-and-error in the TPP process, accelerating the discovery of ideal fabrication conditions. Finite element analysis was employed to design and simulate the performance of the MSFS, guiding structural optimization to achieve high sensitivity and mechanical stability. The fabricated MSFS demonstrated outstanding electromechanical performance, with a sensitivity coefficient of 5.65 and a fabrication accuracy within ±50 nm, setting a new standard for MSFS precision. This work not only pushes the boundaries of sensor miniaturization but also introduces a scalable, efficient pathway for the rapid design and fabrication of high-performance flexible sensors. The development of flexible, high-performance microscale force sensors remains a critical challenge for next-generation biomedical and wearable electronics. Here, we report a novel micro-spring force sensor fabricated via two-photon polymerization using a custom-designed conductive photosensitive resin doped with MXene nanosheets. The resin formulation was optimized to balance mechanical strength and electrical conductivity while ensuring high-resolution printability. To accelerate parameter optimization, a support vector machine model was trained to predict polymerization outcomes based on laser conditions and material compositions, achieving a prediction accuracy of 92.66%. Finite element analysis guided the design of the MSFS structure, enabling tunable electromechanical performance. The fabricated MSFS exhibited excellent sensitivity high fabrication precision and long-term stability. These results demonstrate the potential of integrating machine learning, functional nanomaterials, and TPP microfabrication to enable scalable, high-precision production of intelligent microsensors for biomedical and soft robotic applications.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".