Wearable sweat sensing technologies have received wide attention for personalized health monitoring with continuous and molecular‐level insight in a noninvasive manner. However, it remains significantly challenging to simultaneously capture a sufficient volume of sweat and achieve stable contact between electrodes and sweat, especially in a relatively mild sweating condition. Herein, a wearable electrochemical fabric sensor is developed by embroidering diversified sensing yarns with a multi‐ply cotton sheath and carbon nanotube‐based sensing fiber core into a super‐hydrophobic fabric substrate. The device allows for sweat enrichment among the core–sheath sensing yarn and reduce ineffective diffusion, thus remarkably increasing the sweat capture efficiency. As a result, only 0.5 µL of sweat is needed to achieve stable circuit connectivity, 1/20 of the lowest volume reported to date. The device also maintains a highly durable sensing performance, obtained even during dynamic deformation processes such as bending, twisting, and shaking. It can be further designed into an integrated sports shirt system, which can perform real‐time monitoring of multiple chemical information (e.g., glucose, Na+, K+, and pH) of sweat for users at the states of both intense exercise conditions such as badminton and relatively mild conditions like walking and eating.
Colloidal Ru nanoparticles and nanorods stabilized by poly (Nvinyl-2-pyrrolidone) were prepared in n-butanol by solvothermal and microwave-assisted alcohol reduction method, respectively. Both colloidal Ru with different morphology were used to catalytic alcoholysis of ammonia borane (H 3 NBH 3 , AB) at room temperature, and their catalytic activities were evaluated by analyzing the H 2 generation from the alcoholysis of AB. The results indicated that the catalytic activity of PVP-Ru nanoparticles was almost two times of PVP-Ru nanorods for the alcoholysis of AB at room temperature. The kinetic study demonstrated that the alcoholysis reaction was 0.9 in terms of PVP-Ru nanoparticles concentration, while 1.6 orders in terms of PVP-Ru nanorods concentration. The apparent activation energies of AB alcoholysis catalyzed by PVPRu nanoparticles and PVP-Ru nanorods were 15.6 ± 1 kJ/mol and 32.8 ± 1 kJ/mol, respectively. The effects of the morphology on the catalytic performance of PVP-Ru nanoparticles and PVP-Ru nanorods in AB alcoholysis were also discussed.
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