Synthesis of silicalite-1 zeolite using silica from elephant grass (Pennisetum purpureum)

Sundari, Citra Deliana Dewi; Setiadji, Soni; Andriani, Ade; Sumiyanto, E; Ivansyah, Atthar Luqman

doi:10.1088/1742-6596/1402/5/055064

Cited by 1 publication

(1 citation statement)

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“…The results indicate that while MFI zeolite is hydrophobic, it can act as a water/ethanol separation technique due to it ability to adsorb ethanol [42]. The hydrophobic nature of MFI zeolites has been discussed in other studies [43], this is an advantageous characteristic in an environmental sensor, where cross sensitivity with humidity is a concern. Furthermore, zeolites have been demonstrated as an effective method for functionalizing holographic materials for VOCs [44,45] as discussed in the next section.…”

Section: Mfi Zeolite Nanoparticlesmentioning

confidence: 87%

Developing novel holographic optomechanical sensing platform for detection of volatile organic compounds

McGovern

Grogan

Amarandei

et al. 2023

Holography: Advances and Modern Trends VIII

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Detecting volatile organic compounds (VOCs) is important, their presence in modern indoor environments being associated to health risks including respiratory diseases and cancers. State-of-the-art VOCs sensors as MEMS and semiconductor devices achieve high sensitivity but exhibit poor selectivity and high cross-sensitivity with other environmental analytes including temperature and humidity. Such sensors often require complex and costly fabrication/operation processes and/or expensive readout equipment. Here, a novel optomechanical sensing platform, based on the combination of a holographic diffractive element and a static deflection bilayer cantilever, is presented. Its operation principle is based on the differential response of the cantilever layers to target analytes, and was verified using COMSOL Multiphysics. The cantilever deflection due to analyte presence was visually measured. As the sensitive layer is a photopolymer, a transmission volume holographic diffraction grating was recorded enabling a second, more sensitive, detection mode based on the variations in the diffracted beam intensity as the cantilever deflection angle changes. We compared the sensitivity of the optomechanical holographic sensor configuration to that of a holographic diffraction grating in a photopolymer layer coated on a glass slide. Selectivity and sensitivity of both configurations was increased by doping the photopolymer matrix with zeolite nanoparticles. The initial tests monitored the diffraction efficiency changes during the 5 minutes exposure time to 1000 ppm ethanol. The TOS presented changes of 1-4% in diffraction efficiency depending on the dopant concentration and photopolymer layer thickness, while the optomechanical sensor exhibited 7-14% change in diffraction efficiency.

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