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Scientific Paper

Karakterisasi sensor QCM dengan pelapisan bahan aktif membran Methyltrioctyl Ammonium Chloride pada elektroda perak terhadap respon NaCl

PhD thesis 2018

Alvi Hasanati

eTheses of Maulana Malik Ibrahim State Islamic University (Maulana Malik Ibrahim State Islamic University), 2018

Abstract

INDONESIA:
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nPengujian sensor Quartz Crystal Microbalance (QCM) berbasis membran lipid digunakan untuk membedakan dua variasi sensor terhadap respon NaCl (rasa asin). Variasi sensor yang digunakan yaitu sensor QCM elektroda perak murni dan sensor QCM dilapisi membran lipid Methyltrioctyl Ammonium Chloride. Faktor karakterisasi tersebut meliputi response time, deteksi limit, dan sensitivitas. Metode dalam penelitian ini yaitu metode analisis regresi linear. Data yang dianalisis dari output sensor QCM yaitu frekuensi osilasi. Pengujian sampel dilakukan sebanyak 20 konsentrasi yaitu 0,1 M – 2 M dengan interval 0,1 M. Hasil response time sensor QCM dengan membran lebih cepat merespon sampel dengan nilai sebesar 12 s. Deteksi limit sensor QCM tanpa membran dapat bekerja pada konsentrasi sampel lebih kecil dari pada sensor QCM dengan membran lipid sebesar 0,8 M. Hasil sensitivitas sensor QCM dengan membran lipid lebih sensitif dengan nilai sensitivitas sebesar 1,78423502 MHz/mM. Berdasarkan data yang didapatkan menunjukkan bahwa sensor QCM dengan lapisan membran lipid Methyltrioctyl Ammonium Chloride lebih selektif daripada sensor QCM tanpa membran lipid.
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nENGLISH:
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nThe testing of Quartz Crystal Microbalance (QCM) membrane based on lipid membrane is used to distinguish two sensor variations to the NaCl (salty taste) response. The used sensor variations are pure silver electrode QCM sensor and QCM sensor is coated with Methyltrioctyl Ammonium Chloride lipid membrane. These characterization factors include response time, limit detection, and sensitivity. The method of this study uses linear regression analysis. The analyzed data from output of QCM sensor is the oscillation frequency. The samples testing is 20 concentrations, that is 0,1 M – 2 M with 0,1 M intervals. The result response time, QCM sensor with membrane responds more quickly with a value of 12 s. Detection limit of QCM sensor without membrane can work at a smaller sample concentration than the QCM sensor with membrane, that is 0,8 M. The sensitivity of QCM sensor with membrane is more sensitive to sample with a sensitivity value of 1,78423502 MHz/M. Based on the data obtained, the QCM sensor with Methyltrioctyl Ammonium Chloride lipid coated membrane is more selective than the QCM sensor without lipid membrane.

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