Glyphosate is widely used as a common pesticide. However, glyphosate residues in food is harmful to human health. In this paper, we proposed a flexible SERS sensor of PANI/GO/Ag film for detecting the pesticide residue of glyphosate. The Raman peak at 1045cm-1 of glyphosate was selected as the object to evaluate the SERS ability. To study the Raman enhancement ability of the flexible SERS sensor on glyphosate, the PANI/GO/Ag film was soaked in different concentrations of glyphosate solution to test the characteristic peak value. The results showed that the EF of glyphosate molecules was 1.1×106 and the LOD was 2.34 nM. After 15 days of storage at room temperature, the SERS enhanced performance of the sensor was up 92% of the initial strength. The PANI/GO/Ag flexible SERS sensor proposed in this paper has the advantages of high efficiency, rapid and specific recognition, which can be widely applied to the current agriculture, biomedicine, food industry, and other fields.
With remarkable improvement in power conversion efficiency (PCE), perovskite solar cells (PSCs) have garnered a lot of interest in the photovoltaic industry. Among them, the all-inorganic CsPbBr3 perovskite has been widely used in solar cells because of its exceptional stability and potential commercial applications. In addition, the advantages of low-temperature preparation that minimizes energy loss and favorable energy level arrangement with a wide band gap have made SnO2 potentially displace TiO2 as the most common electron transport layer (ETL) material. However, the performance of SnO2- based PSCs was restricted by the defects and under-coordinated tin ions in SnO2 films. In this study, we prepared a high-quality SCN-doped tin oxide (SnO2) electron transport layer, obtaining ITO/SCN-SnO2/CsPbBr3/Carbon structural solar cell. The open circuit voltage, fill factor, short circuit current density, and PCE of the best device was 1.37 V, 68.68%, 7.02 mA/cm2, and 6.61%, respectively, higher than the pristine devices. The results indicated that SCN doping could achieve higher-quality SnO2 electron transport layers, thereby improving the performance of inorganic CsPbBr3 perovskite solar cells.
The need for imaging and detecting in various instrument areas has brought light detection and ranging (LiDAR) to the forefront of consumer technology. Among different LiDAR, microelectromechanical system (MEMS) LiDAR has more appeal due to its small size and high integration. However, due to its low resolution and slight scanning angle, MEMS LiDAR does not apply to all scenes. Thus we presented a 360-deg scanning LiDAR emission optical system. Design formulas were deduced from theoretical formulas. In this system, the aspheric lens collimated the beam, MEMS micromirrors tracked the concentric circular beams, and the converging lens compensated for the divergence of the outgoing beam. By doing so, the target was scanned 360 deg at high resolution. With Zemax, the fast-axis divergence angle was 0.2484 mrad, the slow-axis divergence angle was 0.1546 mrad, and the system energy utilization rate was 84.16% with an angular resolution of 0.0142 deg at a distance of 10,000 mm. We have provided a potential solution for improving the scanning angle and resolution of MEMS LiDAR.
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