Introduction to the results
This article, Xinjiang University Professors Zhang Jun and Duan Haiming et al. published in the journal "J. Mater. Chem. A" titled "A dog nose-inspired high-performance NH3 gas sensor of biomass carbon materials with a pleated structure derived from rose tea", research was inspired by the similarity between the fold structure of rose petals and the fold structure of dog maxillary turbinates. Using rose petals as raw materials, porous biomass carbon material with a wrinkle structure was successfully prepared through direct carbonization. Detailed SEM and TEM characterization showed that carbonized rose tea (CRT) exhibits a very similar simulated structure to the dog's maxillary turbinate at 600°C.
According to the density functional theory calculated based on first principles , a trace amount of K element was detected in the prepared cathode ray tube material, which effectively improved the adsorption capacity of the cathode ray tube material for NH3. Therefore, the CRT sensor shows an ultra-high response (60.16k%) to 500 ppm NH3, with a theoretical detection limit of only 4.82 ppb. In addition, it also shows fast recovery (2.0s), excellent repeatability and long-term stability. In addition, the formation of nanopores in the wrinkle structure of the cathode ray tube and the sensing mechanism of NH3 were also analyzed. This study provides a new strategy for preparing high-performance gas sensors with biomimetic structures by directly utilizing the similarity between the biomass structure and the dog nose structure through a simple, cheap, and efficient method.
Image and text introduction
Figure 1. (a) Schematic diagram of CRT, (b) XRD spectrum, (c and d) Raman spectrum and (e) FTIR spectrum of ORT and CRT.
Figure 2. (a-c) SEM and (d-g) TEM images of CRT, (h) the structural composition of rose petals and the process of holes that may be formed in CRT at high temperatures.
Figure 3. (a) SEM image of CRT and corresponding EDS element mapping of C, O, and K. (b) Measured XPS spectra, (c) high-resolution XPS spectra of C1s, (d) O1s, (e) K2p (f) relative percentage content of OC in CRT.
Figure 4. (a) Sensing curve of CRT for 500 ppm NH3, 1000 ppm CH2O, H2O2, C2H6O, C3H9N, C6H6O, C6H7N, C2H4O2, C6H15N, C3H6O, 50 ppm O3 and 85% RH at room temperature. (b) Average response, (c) response time, and (d) recovery time of target analytes for 3 cycles of CRT.
Figure 5. (a-c) Response curves of lamb stored at ambient temperature (25°C) for 6, 12 and 24 hours, respectively, and (d) corresponding line graph.
Figure 6. (a) Surface and internal structure of CRT with bionic structure, (b) interaction between NH 3 molecules and CRT, (c) detection mechanism of NH3 by CRT.
Summary
Inspired by the similarity between the wrinkled structure of rose petals and the dog's maxillary turbinate, a porous CRT with a wrinkled structure was successfully prepared using rose petals as raw materials and a simple and environmentally friendly carbonization method. The K element in rose was used to achieve K doping, which effectively improved the adsorption capacity of CRT for NH3 based on first-principles calculations. CRT has the characteristics of high sensitivity, high selectivity, rapid recovery, good stability and good repeatability for NH3. CRT sensors have also been successfully used to detect the freshness of mutton. The sensing mechanism of NH3 by cathode ray tubes was analyzed, and it was pointed out that the combination of bionic structure, K doping and small relative molecular weight plays a synergistic sensitization effect in NH3 detection. This research provides a new strategy for directly utilizing the similarity between biomass structure and canine nose structure to prepare biomimetic sensing materials in a low-cost, simple and green method.
Literature:
https://doi.org/10.1039/D2TA02670H
