Fast-response humidity-sensing films based on methylene blue aggregates formed on nanoporous semiconductor films

Ishizaki, Ryota; Katoh, Ryuzi

doi:10.1016/j.cplett.2016.04.032

Cited by 17 publications

(13 citation statements)

References 19 publications

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“…1 . Here, MB has very good absorptivity towards environment change and is widely used as the sensing material for chemical sensors due to the high molar absorption coefficient 18 . The MB and Graphene composite with different particle sizes is utilized in the ratio of 1:1 as following MB and bulk Graphene flakes composite (MB/BGF), MB and Graphene flakes composite (MB/GF), MB and Graphene quantum dots composite (MB/GQD).…”

Section: Introductionmentioning

confidence: 99%

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

Khan

Hassan

Shaukat

et al. 2021

Sci Rep

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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.

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Section: Introductionmentioning

confidence: 99%

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

Khan

Hassan

Shaukat

et al. 2021

Sci Rep

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“…The phenomena of reversible changes in object color and emission color triggered by chemical vapors such as moisture, volatile organic molecules, and gaseous acids and bases in the surroundings of the materials are referred to as "vapochromism" and "vapochromic emission", respectively. A variety of materials exhibiting such phenomena have been created in recent years, including organic crystals, polymer films, organometallic and coordination complexes that exhibit change in their object colors and/or emitting colors due to change in, e.g., interactions to volatile molecules, conformation of the molecules, and/or crystal structures upon exposure to vapors [1][2][3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Emission Properties of Hybrid Films of Benzylideneaniline-based Amorphous Molecular Materials with Organic Acids

Tsukada

Nakano

2021

J. Photopol. Sci. Technol.

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“…Aiming at a rapid response, various systems have recently been developed using MOFs 36,37 and supramolecular porous crystals 33,38 , which have a large surface area directly accessible to the inner chromophores. The fabrication of thin films is an effective way to achieve a rapid response 39–41 . Meanwhile, soft materials have an advantage in terms of stimulus responsiveness and chemical sensing 42–46 .…”

Section: Introductionmentioning

confidence: 99%

Fast and stable vapochromic response induced through nanocrystal formation of a luminescent platinum(II) complex on periodic mesoporous organosilica

Matsukawa

Yoshida

Tsunenari

et al. 2019

Sci Rep

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A hybrid vapoluminescent system exhibiting fast and repeatable response was constructed using periodic mesoporous organosilica with bipyridine moieties (BPy-PMO) and a Pt(II) complex bearing a potentially luminescent 2-phenylpyridinato (ppy) ligand. An intense red luminescence appeared when the Pt(II)-complex immobilised BPy-PMO was exposed to methanol vapour and disappeared on exposure to pyridine vapour. The ON-OFF vapochromic behaviour occurred repeatedly in a methanol/pyridine/heating cycle. Interestingly, a rapid response was achieved in the second cycle and cycles thereafter. Scanning and transmission electron microscopies (SEM/TEM), absorption and emission, and nuclear magnetic resonance spectroscopies, mass spectrometry, and powder X-ray diffraction indicated that methanol vapour induced Si-C cleavage and thus liberated [Pt(ppy)(bpy)]Cl (bpy = 2,2′-bipyridine) from the BPy-PMO framework. Furthermore, the self-assembling properties of the Pt(II) complex resulted in the formation of highly luminescent micro/nanocrystals that were homogeneously dispersed on the porous support. The unique vapoluminescence triggered by the unprecedented protodesilylation on exposure to protic solvent vapour at room temperature is attributable to BPy-PMO being a giant ligand and an effective vapour condenser. Consequently, this hybrid system presents a new strategy for developing sensors using bulk powdery materials.

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Fast-response humidity-sensing films based on methylene blue aggregates formed on nanoporous semiconductor films

Cited by 17 publications

References 19 publications

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

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

Emission Properties of Hybrid Films of Benzylideneaniline-based Amorphous Molecular Materials with Organic Acids

Fast and stable vapochromic response induced through nanocrystal formation of a luminescent platinum(II) complex on periodic mesoporous organosilica

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