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Azlouk, Manel (author), Basyooni-M.Kabatas, Mohamed A. (author), Eker, Yasin Ramazan (author), Zor, Erhan (author), Bingol, Haluk (author)This study introduces the development of novel, flexible gas sensors operating at room temperature (RT), utilizing a graphene oxide (GO) via the modified Hummers' method and bacterial nanocellulose (BNC) composite to enhance gas detection in industrial and environmental settings. The composite materials, denoted as GO@BNC, were synthesized...journal article 2024
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Wolffenbuttel, R.F. (author), Winship, Declan (author), Bilby, David (author), Visser, Jaco (author), Qin, Yutao (author), Gianchandani, Yogesh (author)Fabry–Perot interferometers (FPIs), comprising foundry-compatible dielectric thin films on sapphire wafer substrates, were investigated for possible use in chemical sensing. Specifically, structures comprising two vertically stacked distributed Bragg reflectors (DBRs), with the lower DBR between a sapphire substrate and a silicon-oxide (SiO2)...journal article 2024
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Karmakar, Sourav (author), Deepak, Mavuri Sai (author), Nanda, Om Priya (author), Sett, A. (author), Maity, Palash Chandra (author), Karmakar, Gairik (author), Sha, Rinky (author), Badhulika, Sushmee (author), Bhattacharyya, Tarun Kanti (author)While the majority of the reports on toluene gas sensors are on rigid electrodes and based on composite materials, doping with additional noble metals, or a high temperature detection method, this work is the first demonstration of the vanadium carbide (V<sub>2</sub>C) MXene based flexible and room-temperature (RT) toluene gas sensor. The V...journal article 2024
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Chen, Honghao (author), Yue, Xiaorui (author), Fan, Yifei (author), Zheng, Bin (author), Lv, Sitao (author), Wang, Fengnan (author), Gao, Yixun (author), French, P.J. (author), Wang, Yao (author)Inspired by the activation mechanism of slow anion channels 1 (SLAC1) in plants that proton pump reversibly induces plant stomata open for CO2 adsorption, a CO2-switching H+ conduction/HCO3− diffusion dual ion channel (CO2-switching-DIC) was constructed by assembling γ-cyclodextrin-MOF (γ-CD-MOF) and 3,4,9,10-perylenetetracarboxylic acid (PTCA)...journal article 2024
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de Gruijl, David (author)Much like wearable devices today, ingestible devices have emerged as a promising platform for continuous health monitoring, and potentially even intervention. Recent research has demonstrated the feasibility of ingestible devices with a retention mechanism, enabling them to remain in the stomach for weeks. Equipping these devices with sensors...master thesis 2023
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Liang, Hongping (author), Guo, Xin (author), Guo, Lanpeng (author), Liu, Siying (author), Zhan, Qiuqiang (author), Yang, Haihong (author), Li, Hao (author), de Rooij, Nicolaas Frans (author), Lee, Yi Kuen (author), French, P.J. (author), Wang, Yao (author), Zhou, Guofu (author)Constructing near-infrared light (NIR) light-enhanced room temperature gas sensors is becoming more promising for practical application. In this study, learning from the structure and photosynthetic process of chlorophyll thylakoid membranes in plants, the first “Thylakoid membrane” structural formaldehyde (HCHO) sensor is constructed by...journal article 2023
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Peña, Álvaro (author), Matatagui, Daniel (author), Ricciardella, F. (author), Sacco, L.N. (author), Vollebregt, S. (author), Otero, Daniel (author), López-Sánchez, Jesús (author), Marín, Pilar (author), Horrillo, Mari Carmen (author)Nitrogen dioxide (NO<sub>2</sub>) is a potential hazard to human health at low concentrations, below one part per million (ppm). NO<sub>2</sub> can be monitored using gas sensors based on multi-layered graphene operating at ambient temperature. However, reliable detection of concentrations on the order of parts per million and lower is...journal article 2023
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Shooshtari, M. (author), Vollebregt, S. (author), Vaseghi, Yas (author), Rajati, Mahshid (author), Pahlavan, Saeideh (author)Detection of hazardous toxic gases for air pollution monitoring and medical diagnosis has attracted the attention of researchers in order to realize sufficiently sensitive gas sensors. In this paper, we fabricated and characterized a Titanium dioxide (TiO2)-based gas sensor enhanced using the gold nanoparticles. Thermal oxidation and sputter...journal article 2023
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Beydilli, Esad (author)Metal oxide nanoparticle gas sensors showpromise due to their high sensitivity towards a wide range of gases, low costs, and low complexity. Particle sizes at nanometers offer a high surface-to-volume ratio which provides more areas on the surface where reactions can occur. This work presents the application of spark ablated nanoparticles on...master thesis 2022
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Meng, Hanxing (author)Graphene as an allotrope of carbon is promising for the detection of gaseous molecules due to its extremely high surface-to-volume ratio. However, its low selectivity poses a major problem for practical applications. The work presented in this thesis addresses the selectivity problem by depositing metal/metal oxide nanoparticles (NPs) on the...master thesis 2022
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Ramachandrappa Venkatesh, M. (author)A MEMS gas sensor consists of a transducer, mainly a resistive or capacitive transducer coated with a thin film of specific functional materials. Functional materials can change their electrical, optical, magnetic, or mechanical properties based on the stimuli received. In a chemi-resistive or chemi-capacitive gas sensing system, thin film of...doctoral thesis 2022
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Shooshtari, M. (author), Sacco, L.N. (author), van Ginkel, H.J. (author), Vollebregt, S. (author), Salehi, Alireza (author)An ethanol gas sensor based on carbon nanofibers (CNFs) with various densities and nanoparticle functionalization was investigated. The CNFs were grown by means of a Plasma-Enhanced Chemical Vapor Deposition (PECVD), and the synthesis conditions were varied to obtain different number of fibers per unit area. The devices with a larger density of...journal article 2022
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Aghaseyedi, Maryam (author), Salehi, Alireza (author), Valijam, Shayan (author), Shooshtari, M. (author)A microfluidic-based gas sensor was chosen as an alternative method to gas chromatography and mass spectroscopy systems because of its small size, high accuracy, low cost, etc. Generally, there are some parameters, such as microchannel geometry, that affect the gas response and selectivity of the microfluidic-based gas sensors. In this study, we...journal article 2022
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Isaac, N. A. (author), Pikaar, I. (author), Biskos, G. (author)To meet requirements in air quality monitoring, sensors are required that can measure the concentration of gaseous pollutants at concentrations down to the ppb and ppt levels, while at the same time they exhibiting high sensitivity, selectivity, and short response/recovery times. Among the different sensor types, those employing metal oxide...review 2022
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Gao, Yixun (author), Wang, Jianqiang (author), Feng, Yancong (author), Cao, Nengjie (author), Li, Hao (author), de Rooij, Nicolaas Frans (author), Umar, Ahmad (author), French, P.J. (author), Wang, Yao (author), Zhou, Guofu (author)It is a great challenge to develop efficient room-temperature sensing materials and sensors for nitric oxide (NO) gas, which is a biomarker molecule used in the monitoring of inflammatory respiratory diseases. Herein, Hemin (Fe (III)-protoporphyrin IX) is introduced into the nitrogen-doped reduced graphene oxide (N-rGO) to obtain a novel...journal article 2022
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Shooshtari, Mostafa (author), Pahlavan, S. (author), Rahbarpour, Saeideh (author), Ghafoorifard, Hasan (author)The low operating temperature of nanowire gas sensors along with their high surface-to-volume ratio are two factors that make gas sensors more practical. In this paper, the growth of ZnO nanowires on a vertically aligned CNT forest is reported. The utilized method for ZnO growth was a rapid microwave-assisted hydrothermal route, which...journal article 2022
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Sacco, L.N. (author), Meng, Hanxing (author), Vollebregt, S. (author)This work demonstrates a humidity sensor based on two multi-layered graphene (MLG) strips monolithically integrated onto a micro-hotplate (MHP). A transfer-free approach was adopted to release the graphene from the catalyst to reduce device variations and ensure scalability. The sensing performance of the device was tested by exposing the device...conference paper 2022
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van Damme, Niels (author), Stijns, Anne (author), Fakkel, Stein (author)This document reports details the development of a solid stool detection system. On behalf of Momo Medical - a TU Delft-based startup company - a device for detecting defecates by elderly people has been designed. The goal of the detection system is to detect solid stools by elderly patients wearing a diaper and to notify the nurses in a nursing...bachelor thesis 2021
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Fijneman, Mark (author), Chin-On, Maxim (author), Yousef, Gabriel (author)This report details the software part of the development process of the eNose technology. The technology is posed by Momo Medical. Momo Medical is a start-up company located in Delft, it provides and develops non-intrusive monitoring systems in the nursing sector. The project is the next step in an already existing product: BedSense. BedSense...bachelor thesis 2021
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Steijlen, A.S.M. (author), Bastemeijer, J. (author), Nederhoff, R.J. (author), Jansen, K.M.B. (author), French, P.J. (author), Bossche, A. (author)Ammonium levels in sweat can potentially be used to measure muscle fatigue and to diagnose particular metabolic myopathies. To research the potential use of ammonia in sweat as a biomarker, a new real-time monitoring system is developed. This system consists of a capsule that is placed on the skin and ventilated with dry air. A metal-oxide...journal article 2021