Highly accurate particulate matter detection assisted by an air heater based on a silver nanowire film

Abstract

Recently, many studies have been carried out to solve the particulate matter pollution problem. However, the detection accuracy for particulate matter in the atmosphere remains unsatisfactory due to the influence of the air relative humidity. Herein, we report a Ag nanowire film air heater to enhance the detection accuracy through internal heating. From air temperature and air relative humidity relationship analysis, it has been found that the Ag nanowire film air heater can form the most suitable air relative humidity in the detection system, thereby enhancing the detection accuracy. Consequently, the Ag nanowire film air heater-assisted light scattering particulate matter detector has achieved tremendous enhancement in its detection accuracy, which is comparable with the data obtained by the beta gauge method. Film resistance plays a key role in internal air temperature distribution and the resultant air relative humidity at given voltages. To achieve the most suitable air relative humidity for continuous online monitoring, response time and power consumption should be balanced. Therefore, guidance for designing Ag nanowire films with proper resistance used in an optional-sized detector has been given for quick response, high accuracy and low power consumption. This work is of significance for providing insight for future studies in particulate matter detection and pollution remediation.

Enhancing the Optical Response Speed of Thermochromic Paper Displays by Heat Exchange Manipulation of Invisible Heaters

“…AgNW coverage adjustment has been frequently and skillfully used to tune the heat-transfer coefficient between the film heater and the different environment in our previous work for thermal response control. 19,35,36 It is much easier by the spray coating in this work, as shown in Figure 1b. According to the percolation theory, 37,38 the film conductivity and surface density of AgNWs obey the rules below…”

“…Besides the discussed resistance and voltage, the key parameter of the heat-transfer coefficient ( h ) should be manipulated. AgNW coverage adjustment has been frequently and skillfully used to tune the heat-transfer coefficient between the film heater and the different environment in our previous work for thermal response control. ,, It is much easier by the spray coating in this work, as shown in Figure b. According to the percolation theory, , the film conductivity and surface density of AgNWs obey the rules below where σ is the film conductivity, R sh is the film sheet resistance, N is the surface density of AgNWs ( N C is the percolation threshold for N ), V is the volume of the coated AgNW ink ( V C is the percolation threshold for V ), and a is the spatial parameter.…”

Heterogeneous nucleation optimization from AgCl and reduction control in ethylene glycol for fast and reproducible synthesis of silver nanowires

“…was prepared according to our previous work [43,44]. Spraying was performed using an airbrush with a nozzle size of 0.3 mm (Iwata Eclipse HP-CS, Japan).…”