A sweat-responsive covalent organic framework film for material-based liveness detection and sweat pore analysis

Abstract

Covalent organic frameworks have shown considerable application potential and exceptional properties in the construction of stimulus-responsive materials. Here, we designed a sweat-responsive covalent organic framework film for material-based fingerprint liveness detection. When exposed to human sweat, the COFTPDA-TFPy film can transform from yellow to red. The COFTPDA-TFPy film, when touched by living fingers, can produce the naked-eye-identified fingerprint pattern through the sweat-induced color change, while artificial fake fingerprints cannot. This technique, which we named material-based liveness detection, can thus intuitively discern living fingers from fake fingerprints with a 100% accuracy rate. Additionally, the distribution of sweat pores on human skin can also be collected and analyzed by shortening the contact time. By merely washing them with ethanol, all the samples can be utilized again. This work inventively accomplished material-based liveness detection and naked-eye-identified sweat pore analysis and highlighted their potential for use in clinical research and personal identification.

Smart Home Sleep Respiratory Monitoring System Based on a Breath-Responsive Covalent Organic Framework

“…Hence, for further studies, the results from the back-side measurements were utilized (Figure 2e). Projection data of the out-of-plane patterns revealed Bragg diffraction ring positions at 0.38 (110), 0.54 (200), 0.76 (220), and 0.85 (310) Å −1 , which matched well with the powder Xray diffraction (PXRD) pattern of COF TPDA-TFPy (Figure S3) and the experimental model, 52 further confirming the successful synthesis of the COF TPDA-TFPy thin film on the surface of the IDE chip (Figure 2f). In addition, Fourier-transform infrared (FTIR) spectroscopy and solid-state nuclear magnetic resonance (NMR) measurements were performed on the COF powder obtained from the same reaction vessel.…”

“…For instance, precisely designed and synthesized COF materials have demonstrated stimulusresponsive properties toward various gases, such as benzene, 48 nitrogen dioxide, 49 ozone, 50 organic solvent vapors, 51 and water vapor. 51,52 Changes in color, fluorescence, and electrical properties have been observed, showcasing reversible, rapid, and stable gas response and sensing behaviors. Among them, several researches have demonstrated the color-changing and electrical response of COFs to water vapor and humidity, exhibiting good reversibility and rapid response time.…”

“…Covalent organic frameworks (COFs) are a series of crystalline organic porous materials that have emerged in the past decade. COFs possess numerous advantages such as high specific surface area, strong designability, and high stability. − They have been widely studied and applied in many areas such as gas separation and adsorption, − catalytic science, , energy science, − and chemical and biomedical sensing. − In recent years, research and applications of stimulus-responsive COFs and their sensing properties have been on the rise. − These COFs possess ordered pore structures that provide a venue for rapid molecular exchange as well as ordered and regularly distributed functional structures, which exhibit desirable characteristics including excellent responsiveness, rapid response time, and good reversibility. For instance, precisely designed and synthesized COF materials have demonstrated stimulus-responsive properties toward various gases, such as benzene, nitrogen dioxide, ozone, organic solvent vapors, and water vapor. , Changes in color, fluorescence, and electrical properties have been observed, showcasing reversible, rapid, and stable gas response and sensing behaviors. Among them, several researches have demonstrated the color-changing and electrical response of COFs to water vapor and humidity, exhibiting good reversibility and rapid response time. − Leveraging these characteristics, a COF material with reversible and rapid response to water vapor was chosen as the sensing core material, and combined with circuit board design and software development, an attractive wireless respiratory sensing system was developed for continuous monitoring of clinical sleep respiratory behavior in real-life scenarios.…”

“…For instance, precisely designed and synthesized COF materials have demonstrated stimulus-responsive properties toward various gases, such as benzene, nitrogen dioxide, ozone, organic solvent vapors, and water vapor. , Changes in color, fluorescence, and electrical properties have been observed, showcasing reversible, rapid, and stable gas response and sensing behaviors. Among them, several researches have demonstrated the color-changing and electrical response of COFs to water vapor and humidity, exhibiting good reversibility and rapid response time. − Leveraging these characteristics, a COF material with reversible and rapid response to water vapor was chosen as the sensing core material, and combined with circuit board design and software development, an attractive wireless respiratory sensing system was developed for continuous monitoring of clinical sleep respiratory behavior in real-life scenarios.…”

Nanoporous N-Rich Covalent Organic Frameworks with High Specific Surface Area for Efficient Adsorption of Iodine and Methyl Iodide

“…The solid-state 13 C NMR spectrum of TTA-DMTP-COF is shown in Figure S3. The peak at 152.25 ppm is assigned to the carbon on the newly generated imine bond, and the peak at the carbon on the −CN on the benzene ring is at 168.08 ppm. These all indicate the successful synthesis of TTA-DMTP-COF.…”