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Abstrak -Telah berhasil dibuat film tipis Ba 0.55 Sr 0.45 TiO 3 di atas substrat Corning Glass 7059 dengan metode Chemical Solution Deposition (CSD) berbantuan spin coating berkecepatan putar 3000 rpm selama 30 detik dalam kelarutan 1 M. Film tipis di annealing pada suhu 550 o C, 575 o C, selama 22 jam. Sifat optik dilakukan dengan alat Ocean Optic USB 4000 pada rentang gelombang cahaya tampak (350-790 nm) diperoleh energi bandgap sebesar 1.888 eV dan 1.712 eV. Kata Kunci: Ba 0.55 Sr 0.45 TiO 3 , CSD, energi bandgap, film tipis Abstract -Have been successfully created a thin film Ba 0.55 Sr 0.45 TiO 3 above the substrate of Corning Glass 7059 by the method of Chemical Solution Deposition (CSD) assisted with spin coating's turning speed 3000 rpm for 30 seconds in the solubility of 1 M. Thin film was annealed at temperature of 550 o C, 575 o C for 22 hours. Optical characterization was carried out by Ocean Optic USB 4000 device on wave range Visible (350-790 nm) that was obtained the energy bandgap of 1.888 eV dan 1.712 eV.

Dalam penelitian ini, film tipis material feroelektrik Barium Zirkonium Titanat (BaZr0,5Ti0,5O3) disintesis dan pengaruh variasi suhu annealing terhadap sifat optiknya dipelajari. Film tipis BaZr0,5Ti0,5O3 ditumbuhkan di atas substrat Silikon (Si (100)) menggunakan metode Chemical Solution Deposition (CSD) dengan bantuan perangkat spin coater. Film tipis yang telah dibuat kemudian di-annealing pada tiga suhu berbeda (750 oC, 800 oC dan 850 oC). Karakterisasi sifat optik dari film tipis yang telah dibuat dilakukan menggunakan Spektrometer Ultraviolet-Visible (UV-Vis) Ocean Optics USB4000. Hasil karakterisasi menunjukkan bahwa film tipis BaZr0,5Ti0,5O3 yang dibuat memiliki nilai reflektansi yang tinggi pada panjang gelombang cahaya tampak dan nilai koefisien absorbansi yang tinggi pada panjang gelombang cahaya ultraviolet (UV). Nilai bandgap pada masing-masing film tipis BaZr0,5Ti0,5O3 dengan suhu annealing 750 oC, 800 oC dan 850 oC adalah 3,04 eV, 3,07 eV dan 3,22 eV. Semakin tinggi suhu annealing maka semakin tinggi nilai bandgap yang dihasilkan. Dari hasil yang diperoleh, terlihat bahwa film tipis BaZr0,5Ti0,5O3 yang dihasilkan memiliki sifat semikonduktor dan berpotensi digunakan sebagai sensor atau komponen elektronik yang bekerja memanfaatkan energi pada panjang gelombang cahaya ultraviolet.

Liquefied Petroleum Gas (LPG) is a flammable gas. Leaks in LPG gas cylinders that are not known to the user can have a fatal impact if there is no system that detects and stop the leak. Therefore, this study designed a system to detect and solve LPG gas leaks based on the Internet of Things automatically. The way this system works is that the MQ-6 sensor detects the concentration of LPG gas around the cylinder with an analog value limit when the safe condition is <400 and the danger condition is 400. The sensor will continue to detect as long as the tool is on and send data to the microcontroller in the form of NodeMCU ESP8266 which then transmits the data to Firebase. From Firebase, users will get information about LPG gas levels in safe/dangerous conditions, gas position control, as well as fan and buzzer conditions through a smartphone application in real time. If the conditions are safe, the green LED will light up and the condition is dangerous, the microcontroller will physically respond to the servo motor to turn the regulator valve open, the fan, the red LED and the buzzer while virtually the user will get information through the application and notifications via the WhatsApp application in the form of a short message as a warning that gas was detected. The test results show that the LPG gas detection system can work well.