Soft neural electrode arrays that are mechanically matched between neural tissues and electrodes offer valuable opportunities for the development of disease diagnose and brain computer interface systems. Here, a thermal release transfer printing method for fabrication of stretchable bioelectronics, such as soft neural electrode arrays, is presented. Due to the large, switchable and irreversible change in adhesion strength of thermal release tape, a low‐cost, easy‐to‐operate, and temperature‐controlled transfer printing process can be achieved. The mechanism of this method is analyzed by experiments and fracture‐mechanics models. Using the thermal release transfer printing method, a stretchable neural electrode array is fabricated by a sacrificial‐layer‐free process. The ability of the as‐fabricated electrode array to conform different curvilinear surfaces is confirmed by experimental and theoretical studies. High‐quality electrocorticography signals of anesthetized rat are collected with the as‐fabricated electrode array, which proves good conformal interface between the electrodes and dura mater. The application of the as‐fabricated electrode array on detecting the steady‐state visual evoked potentials research is also demonstrated by in vivo experiments and the results are compared with those detected by stainless‐steel screw electrodes.

The β-Cs₃Cu₂Cl₅ nanocrystals were developed as high-performance scintillators, which showed a PLQY of 94.6% and a radioluminescence light yield of ∼34000 photons per MeV. A high spatial resolution in the X-ray imaging results was demonstrated.

Real-time monitoring of breath can provide clinically relevant information about apnea syndrome and other important aspects of human physiology. Here, we introduce a flexible skin-like breath sensor developed by transfer-printing vanadium dioxide (VO ₂ ) thin films on PDMS substrates. This flexible breath sensor can conformably laminate on the skin under the nose with different curvatures and operate at different environment temperatures through day and night. Attributed to the high temperature coefficient of resistance of VO ₂ , the enhanced breath sensing performance was demonstrated and the response time and recovery time can be as fast as 0.5 s. The excellent sensing performance and fast response time indicate that the VO ₂ -based breath sensor is feasible in monitoring breath for prevention of apnea syndrome.

The morphology and crystalline quality of perovskite layers are crucial to fabricate high efficiency and high stability perovskite solar cells (PSCs). In this work, we investigated how the substrate temperature influences the crystallization process of the mixed-ion perovskite material (FAPbI3)_0.85(MAPbBr₃)_0.15. The intermediate phase formation, the following perovskite phase transformation, and the film morphology were studied by spin-coating the perovskite material onto hot substrates using microscopy and X-ray diffraction methods. The results show that elevating the substrate temperature alters the morphology of perovskite films from pure dendritic to dendritic/island co-existing structures. The appearance of islands increases the defect density in the perovskite layer and deteriorates the device performance. The substrate temperature has to be controlled in a certain range to form a high crystallinity perovskite layer. The morphology evolution mechanism was also discussed. This work provided a better understanding of the roles of DMSO and temperature in the crystallization process, which will provide more opportunities and guidance for the upscaling of mixed-ion perovskite solar cell manufacturing.

Flexible temperature and mechanical sensing capabilities are of great importance in the artificial intelligence. Here, we report a skin conformable, high sensitive temperature-mechanical dual-parameter sensor based on a PET/vanadium dioxide (VO ₂ )/PDMS multilayer structure fabricated using the transfer printing technique. The ultrahigh mechanical sensitivity to strains in the range of 0%-0.1% with a gauge factor over 400 was attributed to the disconnection-reconnection process of the ziplike nanoscale cracks under strain or vibration. And the enhanced temperature sensing performance with a resolution of 0.1 K was attributed to the high temperature coefficient of resistance of VO ₂ material. The temperature and the mechanical signals simultaneously recorded in the electrical resistance signal were separated via fast Fourier transform (FFT) and inverse FFT. The flexibility and ultra-sensitivity to temperature and vibration make the sensor a promising application in advanced artificial intelligence.