Low-frequency electrohydrodynamic convection patterns in nematic liquid crystal aligned using parallel-oriented nanofiber

Mahendra, Bhisma; Nugroho, Fahrudin; Yusuf, Yusril

doi:10.7567/jjap.57.021701

Cited by 12 publications

(14 citation statements)

References 20 publications

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“…Nanostructured materials have become one of the most studied materials for devices, especially those used for gas sensing [ 15 , 16 , 17 ]. These materials, including nanofibers, have a large specific surface area, high porosity, and interconnected porous structures [ 18 , 19 , 20 ], which are advantageous for preparing gas sensing devices. The gas sensor prepared by nanostructured materials has a better sensitivity [ 21 , 22 , 23 ] because of the increase in the specific surface area of the materials [ 22 , 23 ].…”

Section: Introductionmentioning

confidence: 99%

Polyacrylonitrile Nanofiber-Based Quartz Crystal Microbalance for Sensitive Detection of Safrole

Rianjanu

Roto

Julian

et al. 2018

Sensors

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Safrole is the main precursor for producing the amphetamine-type stimulant (ATS) drug, N-methyl-3,4-methylenedioxyamphetamine (MDMA), also known as ecstasy. We devise a polyacrylonitrile (PAN) nanofiber-based quartz crystal microbalance (QCM) for detecting safrole. The PAN nanofibers were fabricated by direct electrospinning to modify the QCM chips. The PAN nanofiber on the QCM chips has a diameter of 240 ± 10 nm. The sensing of safrole by QCM modified with PAN nanofiber shows good reversibility and an apparent sensitivity of 4.6 Hz·L/mg. The proposed method is simple, inexpensive, and convenient for detecting safrole, and can be an alternative to conventional instrumental analytical methods for general volatile compounds.

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Section: Introductionmentioning

confidence: 99%

Polyacrylonitrile Nanofiber-Based Quartz Crystal Microbalance for Sensitive Detection of Safrole

Rianjanu

Roto

Julian

et al. 2018

Sensors

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“…Polymer-based nanofiber materials have been continuously utilized for various applications (e.g., membrane filter, tissue engineering, drug delivery, and gas sensor). [1][2][3][4] For air quality monitoring, they act as active sensing components that are integrated with signal transducers like electromechanical microcantilevers or quartz crystal microbalance (QCM) platforms. [5][6][7][8][9][10] The nanofibrous mats possess numerous properties that are advantageous for enhancing the gas sensing performance (i.e., small structure, high porosity, large surface area to volume ratio, and adjustable surface).…”

Section: Introductionmentioning

confidence: 99%

Sensitivity prediction and analysis of nanofiber-based gas sensors using solubility and vapor pressure parameters

Rianjanu

Hidayat

Yulianto

et al. 2021

Jpn. J. Appl. Phys.

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Here, we propose a simple yet effective method to predict gas sensor sensitivity based on solubility and vapor pressure. As sensing devices for the case study, we employed quartz crystal microbalance sensors coated with polyvinyl acetate (PVAc) nanofibers. The solubility was represented by the relative energy density (RED), while the vapor pressure was expressed by the logarithm of the vapor pressure (log P). To create a prediction model, a chemometric technique involving a machine learning algorithm of k-nearest neighbor (KNN) regression was used in the analysis. Using both parameters (i.e., RED and log P) as input, a determination coefficient (R 2) of up to 1 was obtained, indicating highly correlated parameters. This proposed method could not only enable an accurate prediction of sensor sensitivity, but also provide a path to select the suitable sensing materials for specific target analytes in high-performance gas sensors.

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“…Nanostructured materials, especially nanofibers, have been studied primarily for devices for gas or vapor sensing (Ding et al 2010;Rianjanu et al 2019a;Sun et al 2012). Nanofibrous structured materials have a large specific surface area, high porosity, and interconnected porous structures (Chotimah et al 2016;Mahendra et al 2018;Rianjanu et al 2018c), which are advantageous for the development of gas or vapor sensing devices. A gas sensor prepared by nanostructured materials has an increased sensitivity due to the larger specific surface areas of the materials (Jia et al 2017.…”

Section: Introductionmentioning

confidence: 99%

An Enhanced Safrole Sensing Performance of a Polyacrylonitrile Nanofiber- Based-QCM Sensor by Overlaying with Chitosan

Rianjanu¹,

Triyana²,

Nurbaiti³

et al. 2019

JSM

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We report on a method to enhance the sensing performance of polyacrylonitrile (PAN) nanofiber-based QCM sensor overlaid with chitosan. The PAN nanofibers were deposited on the QCM sensing surface by electrospinning technique followed by overlay with chitosan by a drop-casting method. The Fourier transform infrared (FTIR) spectra confirm that chitosan covers the PAN nanofibers. The SEM images show the average diameter of the produced PAN nanofibers was 236 nm, and it increased to 283 nm after overlay with chitosan. The modified QCM sensor has the sensitivity of 18.7 Hz mg -1 L, which is better than that of PAN nanofiber alone of 4.5 Hz mg -1 L. It is an increase nearly 5 times. The analytical parameters of the limit of detection (LOD), sensitivity, a time constant, and stability improved after the PAN nanofiber sensor was overlaid with chitosan. The amine groups present in chitosan interact effectively with safrole, thus increase the sensing response. The proposed device is robust, inexpensive, and convenient for detecting safrole, and can be used as an alternative to those of classical instrumental methods for the analysis of safrole as a drug precursor. ABSTRAK Kajian ini melaporkan tentang kaedah untuk meningkatkan prestasi pengesanan poliakrilonitril (PAN) berasaskan sensor gentian nano QCM yang disaluti dengan kitosan. PAN nanofiber diendap pada permukaan pengesan QCM oleh teknik putaran elektro diikuti dengan salutan kitosan melalui kaedah drop-pemutus. Spektrum transformasi Fourier inframerah (FTIR) mengesahkan kitosan menutup gentian nano PAN. Imej SEM menunjukkan diameter purata gentian nano PAN yang dihasilkan adalah 236 nm dan ia meningkat kepada 283 nm selepas bertindih dengan kitosan. Sensor QCM terubah suai mempunyai kesensitifan 18.7 L mg -1 Hz, lebih baik daripada gentian nano PAN sahaja iaitu 4.5 Hz mg -1 L. Ini merupakan peningkatan hampir 5 kali ganda. Analisis parameter had pengesanan (LOD), kesensitifan, pemalar masa dan kestabilan bertambah baik selepas sensor gentian nano PAN disaluti dengan kitosan. Golongan amina yang hadir dalam kitosan berinteraksi secara berkesan dengan safrola, sekaligus meningkatkan respons pengesanan. Peranti cadangan ini teguh, murah dan mudah untuk mengesan safrola dan boleh digunakan sebagai alternatif kepada metod instrumen klasik untuk menganalisis safrola sebagai pelopor dadah.

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Low-frequency electrohydrodynamic convection patterns in nematic liquid crystal aligned using parallel-oriented nanofiber

Cited by 12 publications

References 20 publications

Polyacrylonitrile Nanofiber-Based Quartz Crystal Microbalance for Sensitive Detection of Safrole

Polyacrylonitrile Nanofiber-Based Quartz Crystal Microbalance for Sensitive Detection of Safrole

Sensitivity prediction and analysis of nanofiber-based gas sensors using solubility and vapor pressure parameters

An Enhanced Safrole Sensing Performance of a Polyacrylonitrile Nanofiber- Based-QCM Sensor by Overlaying with Chitosan

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