Covid-19 is an infectious disease caused by acute respiratory syndrome coronavirus 2 (severe acute respiratory syndrome coronavirus 2 or SARS-coV-2). As of June 30, 2020, 216 countries in the world have been confirmed to have Covid-19 with a positive number of 10,117,687 and have died 502,278. Southeast Sulawesi in particular has been confirmed as of June 30, 2020, as many as 363 positive cases, 234 recovered, and 6 deaths. Meanwhile, in Baubau, there were 20 positive confirmed cases. Compliance with health protocols is believed to prevent transmission of Covid-19. Increasing knowledge through education is one of the methods used to increase compliance. This study aims to determine the effectiveness of Covid-19 prevention education through video media and online leaflets on the level of public knowledge in Baubau City. This study uses a Quasi-Experiment with the approach method of The Non-Randomized Without Control Group Pretest and Posttest Design. The population is all people of Baubau City with an affordable population during the Covid-19 pandemic based on 1,600 Whatsapp group participants with a sample size of 120 people. The sampling technique used a purposive sampling method that met certain criteria. Based on the results of statistical tests with Wilcoxon, the value on the use of video media & leaflets was obtained P = 0.001 <0.05, this indicates that there is a significant difference in knowledge before and after online education. On video media P = 0.248> 0.05, this shows that there is no significant difference after online education. Whereas in the media leaflet P = 0.045 <0.05, this indicates that there is a significant difference after online education. In this study, video media & leaflets and leaflet media are more effectively used as education on prevention of COVID-19 online compared to video media alone.
The aim of this research is to improve the sensitivity of ammonia gas sensor (hereafter referred to as sensor) based on poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) by employing the doping dye of bromocresol green (BCG). The doping process was carried out by mixing the BCG and the PEDOT:PSS in a solution with an optimum ratio of 1 : 1 in volume. The sensor was fabricated by using spin-coating technique followed by annealing process. For comparison, the BCG thin film and the PEDOT:PSS thin film were also deposited with the same method on glass substrates. For optical characterization, a red-light laser diode with a 650 nm wavelength was used as light source. Under illumination with the laser diode, the bare glass substrate and BCG film showed no absorption. The sensor exhibited linear response to ammonia gas for the range of 200 ppm to 800 ppm. It increased the sensitivity of sensor based on PEDOT:PSS with BCG doping being about twofold higher compared to that of without BCG doping. Furthermore, the response time and the recovery time of the sensor were found very fast. It suggests that the optical sensor based on BCG-doped PEDOT:PSS is promising for application as ammonia gas sensor.
Selectivity improvement of gas sensor based on Poly(3,4-<i>ethylenedioxythiophene</i>):<i>poly</i>(<i>styrenesulfonate</i>) (PEDOT:PSS) thin film to ammonia gas has been studied. The PEDOT:PSS thin films were deposited on glass and FR4 substrates by using a spin-coating technique. PEDOT:PSS solution was spread on the substrate followed by spinning at fixed rate. Then, the imprinting process of gas sensor was performed by injecting ammonia gas into the spin-coating chamber. Finally, the gas sensor was dried on a controllable hot plate. Current-voltage characteristics of the films were measured by using calibrated electrometer. The results show that by imprinting of ammonia gas to the film affects the electrical conductivity of the film. It is also shown that the electron transport in the PEDOT:PSS thin film tends to be ohmic-contact. When the imprinted sensor is exposed in ammonia gas, we obtained that the sensor has short response and recovery time, a good repeatability (reversible), and higher sensitivity to ammonia gas. To this end, we found that ammonia imprinting on the surface of PEDOT:PSS thin film can improve the selectivity of the sensor to ammonia gas. It indicates that our method can be used for fabricating the sensor which has a single selectivity
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