Wide range and highly linear signal processed systematic humidity sensor array using Methylene Blue and Graphene composite

Abstract

This paper proposes a signal processed systematic 3 × 3 humidity sensor array with all range and highly linear humidity response based on different particles size composite inks and different interspaces of interdigital electrodes (IDEs). The fabricated sensors are patterned through a commercial inkjet printer and the composite of Methylene Blue and Graphene with three different particle sizes of bulk Graphene Flakes (BGF), Graphene Flakes (GF), and Graphene Quantum Dots (GQD), which are employed as an active layer using spin coating technique on three types of IDEs with different interspaces of 300, 200, and 100 µm. All range linear function (0–100% RH) is achieved by applying the linear combination method of nine sensors in the signal processing field, where weights for linear combination are required, which are estimated by the least square solution. The humidity sensing array shows a fast response time (Tres) of 0.2 s and recovery time (Trec) of 0.4 s. From the results, the proposed humidity sensor array opens a new gateway for a wide range of humidity sensing applications with a linear function.

Modeling and Simulation of Graphene-Based Transducers in NEMS Accelerometers

“…Suspended graphene with atomically thin thickness has been used as transducers to fabricate high-performance NEMS sensors for measuring pressure [ 18 , 19 , 20 , 21 , 22 ], humidity [ 23 , 24 ], magnetic field [ 25 , 26 ], gas concentration [ 27 , 28 ], and so on. For instance, the ultra-small and sensitive NEMS piezoresistive pressure sensor based on suspended monolayer graphene membranes was realized in 2013 [ 29 ], and the squeeze-film resonant NEMS pressure sensor based on suspended graphene was reported in 2015 [ 21 ], with a sensitivity of 9000 Hz/mbar that was 45 times higher than state-of-the art MEMS squeeze-film pressure sensors while using a 25-times-smaller membrane area.…”

Bio-Electroanalysis Performance of Heme Redox-Center for π-π Interaction Bonding of a Methylene Blue-Graphene Modified Electrode

“…Li, Y. et al (2011) [ 41 ] utilized anti-CEA/AuNPs/MB/Gp-Nf-modified GCE as an immunosensor to detect carcinoembryonic antigen, and Qiao, L. et al (2014) [ 42 ] used BSA/anti-chlorpyrifos/GS-MB/GNPs-modified GCE to detect chlorpyrifos. The use of a composite of graphene and methylene blue with three different particle sizes of bulk graphene flakes (BGF), graphene flakes (GF), and graphene quantum dots (GQD) as a humidity sensor array was another application [ 43 ]. Since GO lacks an aromatic structure that aids in electron delocalization through their structure and is less effective than Gr in the event of generating potent π–π interactions with MB.…”

One-wire reconfigurable and damage-tolerant sensor matrix inspired by the auditory tonotopy

“…This is due, in large part, to the implementation of time-division multiplexing for their interface, resulting in sequential and periodic sampling (scanning mode) of individual sensors to eventually construct a two-dimensional map of a physical quantity's distribution. In particular, the wiring associated with M × N (M, rows; N, columns) (1-10) and M + N (11)(12)(13)(14)(15)(16)(17)(18)(19)(20)(21)(22)(23)(24)(25)(26)(27) sensor matrices proves problematic, leading to unsightly, space-wasting installations and maintenance difficulties. Furthermore, scalability and reconfigurability are often lacking in existing sensor matrices, as numerous sensor elements are spread across a large substrate that is primarily processed as a whole, with limited capacity for changes in size, profile, and mode for different applications.…”

“…Furthermore, scalability and reconfigurability are often lacking in existing sensor matrices, as numerous sensor elements are spread across a large substrate that is primarily processed as a whole, with limited capacity for changes in size, profile, and mode for different applications. The scanning-mode sensor matrix (16,18,19,21,24,26,(28)(29)(30)(31)(32)(33) is particularly susceptible to mechanical damage, given that a single mechanical disruption to the electrical trace would disable all the sensor units along the entire row/column. To mitigate these limitations, alternative architectures with redundant components and connections have been introduced (34), such as sensor nodes configured in a mesh network, capable of reconfiguring their routing tables to bypass damaged connections.…”