Sensor Kelembapan Menggunakan QCM Dilapisi Reduced Graphene Oxide (rGO)

Hakim, Fikri (2020) Sensor Kelembapan Menggunakan QCM Dilapisi Reduced Graphene Oxide (rGO). Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Sensor kelembapan adalah suatu alat ukur yang digunakan untuk membantu dalam proses pengukuran kelembapan atau jumlah uap air yang terkandung dalam udara. Ada beberapa cara untuk menghitung kelembapan diantaranya dengan menghitung kapasitansi atau resistansi. Alternatif dari kedua metode adalah dengan menggunakan Quartz crystal microbalance (QCM). QCM sendiri merupakan kristal osilator yang mengeluarkan output frekuensi berdasarkan zat yang menempel QCM. QCM butuh dilapisi suatu zat agar bisa digunakan, untuk sensor kelembapan, zat yang digunakan adalah Reduced Graphene Oxide (rGO). Dalam tugas akhir ini, dilakukan perancangan sensor kelembapan menggunakan QCM dilapisi rGO. Langkah pertama yang dilakukan adalah produksi rGO di Laboratorium Material Maju Fisika ITS dengan membersihkan kelapa, dijemur, dan difurnace menghasilkan GO. GO kemudian ditumbuk, diayak Mesh 200, difurnace, dicampur DMSO, diaduk dengan Ultrasonic Cleaner menghasilkan larutan rGO. Setelah itu QCM dibersihkan dengan etanol, direndam Piranha Solution dan disemprot larutan rGO dengan nanospray, namun tahap perendaman Piranha Solution tidak dilakukan. Setelah itu dirancang sistem reciprocal frequency counter dengan STM32F103C8T6, data logger dan kotak uji coba kelembapan. Cara mengatur kelembapan dengan memanaskan ruang didalam kotak uji coba tersebut. Untuk pengujiannya sensor kelembapan SHT31-D digunakan sebagai kalibrator. Hasilnya didapatkan QCM sebagai sensor kelembapan yang frekuensinya naik seiring menurunnya kelembapan dengan daerah kerja uji coba sebesar 25.46%-56.05%, 22.8%-58.12%, dan 23%-58.49%, frekuensi QCM mengalami perubahan sebesar 74.97 Hz, 118.44 Hz, dan 170.42 Hz, dan tingkat ketelitiannya sebesar 2.45 Hz/%, 3.35 Hz/%, dan 4.8 Hz/% (masing-masing untuk penyemprotan 1 detik, 3 detik, dan 5 detik). Sehingga durasi penyemprotan yang optimal adalah 5 detik. ============================================================================================================= Humidity sensor is a measuring instrument used to assist in the process of measuring humidity or the amount of moisture contained in the air. There are several ways to calculate humidity including calculating capacitance or resistance. An alternative to both methods is to use Quartz crystal microbalance (QCM). QCM itself is a crystal oscillator that outputs frequency based on substances that attach to QCM. QCM needs to be coated with a substance that can be used, for the humidity sensor, the substance used is Reduced Graphene Oxide (rGO). In this final project, a humidity sensor design using QCM coated rGO is carried out. The first step taken was the production of rGO at the ITS Advanced Materials Laboratory by cleaning the coconut, drying it, and furnced to produce GO. GO is then pounded, sifted with Mesh 200, furnaced, mixed with DMSO, stirred with an Ultrasonic Cleaner to produce an RGO solution. After that the QCM was cleaned with ethanol, soaked in Piranha Solution and sprayed with RGO solution with nanospray, but the immersion stage of Piranha Solution was not carried out. After that the reciprocal frequency counter system was designed with STM32F103C8T6, data logger and humidity test box. The regulation of humidity by heating the space in the test box. The results obtained by QCM as a humidity sensor whose frequency increases with decreasing humidity with the test range of 25.46% -56.05%, 22.8% -58.12%, and 23% -58.49%, the QCM frequency has changed by 74.97 Hz, 118.44 Hz, and 170.42 Hz, and the level of accuracy is 2.45 Hz /%, 3.35 Hz /%, and 4.8 Hz /% (for spraying 1 second, 3 seconds, and 5 seconds respectively). So the optimal spraying duration is 5 seconds.

Item Type: Thesis (Undergraduate)
Uncontrolled Keywords: Quartz Crystal Microbalance, Sensor Kelembapan, Reduced Graphene Oxide, Quartz Crystal Microbalance, Humidity Sensor, Graphene Oxide
Subjects: Q Science > QC Physics > QC107 .A67 Quartz crystal microbalances.
Q Science > QD Chemistry > QD341.H9 Graphene
T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK7871.674 Detectors. Sensors
T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK7878 Electronic instruments
Divisions: Faculty of Intelligent Electrical and Informatics Technology (ELECTICS) > Electrical Engineering > 20201-(S1) Undergraduate Thesis
Depositing User: Fikri Hakim
Date Deposited: 06 Aug 2020 02:50
Last Modified: 06 Aug 2020 02:50
URI: http://repository.its.ac.id/id/eprint/77037

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