Highly sensitive and fast-response hydrogen sensing of WO3 nanoparticles via palladium reined spillover effect

Carbon monoxide (CO) is an odorless, colorless, tasteless, extremely flammable, and highly toxic gas. It is produced when there is insufficient oxygen supply during the combustion of carbon to produce carbon dioxide (CO2). CO is produced from operating engines, stoves, or furnaces. CO poisoning occurs when CO accumulates in the bloodstream and can result in severe tissue damage or even death. Many types of CO sensors have been reported, including electrochemical, semiconductor metal-oxide, catalytic combustion, thermal conductivity, and infrared absorption-type for the detection of CO. However, despite their excellent selectivity and sensitivity, issues such as complexity, power consumption, and calibration limit their applications. In this study, a fabricbased colorimetric CO sensor is proposed to address these issues. Potassium disulfitopalladate (II) (K2Pd(SO3)2) is dyed on a polyester fabric as a sensing material for selective CO detection. The sensing characteristics and performance are investigated using optical instruments such as RGB sensor and spectrometer. The sensor shows immediate color change when exposed to CO at a concentration that is even lower than 20 ppm before 2 min. The fast response time of the sensor is attributed to its high porosity to react with CO. This easy-to-fabricate and cost-effective sensor can detect and prevent the leakage of CO simultaneously with high sensitivity and selectivity toward CO.

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A metal-organic framework featuring highly sensitive fluorescence sensing for Al3+ ion

CrystEngComm ◽

10.1039/d1ce01115d ◽

2021 ◽

Author(s):

Yang Qiao ◽

Zeqi Li ◽

Mei-Hui Yu ◽

Ze Chang ◽

Xian-He Bu

Keyword(s):

Metal Ions ◽

Human Health ◽

Metal Organic Framework ◽

High Sensitivity ◽

Fluorescence Sensing ◽

Sensing Material ◽

Highly Sensitive ◽

Sensitivity And Selectivity ◽

Metal Organic ◽

Organic Framework

High sensitivity and selectivity for detection of metal ions are very important to protect human health. Fluorescent metal-organic framework (MOF) as a new sensing material has attracted more and more...

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A highly sensitive and selective fluorescent turn-on chemosensor bearing a 7-diethylaminocoumarin moiety for the detection of cyanide in organic and aqueous solutions

New Journal of Chemistry ◽

10.1039/d0nj03003a ◽

2020 ◽

Vol 44 (44) ◽

pp. 19155-19165

Author(s):

Burcu Aydıner ◽

Ömer Şahin ◽

Deniz Çakmaz ◽

Gökhan Kaplan ◽

Kerem Kaya ◽

...

Keyword(s):

Aqueous Solutions ◽

Emission Intensity ◽

High Sensitivity ◽

Turn On ◽

Highly Sensitive ◽

Sensitivity And Selectivity

Novel 7-diethylaminocoumarin based dyes showed high sensitivity and selectivity to cyanide anions in both organic and aqueous solutions, which was observed by a drastic increment in the emission intensity.

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Highly Sensitive, Selective, Flexible and Scalable Room-Temperature NO2 Gas Sensor Based on Hollow SnO2/ZnO Nanofibers

Molecules ◽

10.3390/molecules26216475 ◽

2021 ◽

Vol 26 (21) ◽

pp. 6475

Author(s):

Jiahui Guo ◽

Weiwei Li ◽

Xuanliang Zhao ◽

Haowen Hu ◽

Min Wang ◽

...

Keyword(s):

Room Temperature ◽

Gas Sensing ◽

Positive Impact ◽

High Sensitivity ◽

Detection Sensitivity ◽

Pure Sno2 ◽

Flexible Devices ◽

Low Concentrations ◽

Highly Sensitive ◽

Sensitivity And Selectivity

Semiconducting metal oxides can detect low concentrations of NO2 and other toxic gases, which have been widely investigated in the field of gas sensors. However, most studies on the gas sensing properties of these materials are carried out at high temperatures. In this work, Hollow SnO2 nanofibers were successfully synthesized by electrospinning and calcination, followed by surface modification using ZnO to improve the sensitivity of the SnO2 nanofibers sensor to NO2 gas. The gas sensing behavior of SnO2/ZnO sensors was then investigated at room temperature (~20 °C). The results showed that SnO2/ZnO nanocomposites exhibited high sensitivity and selectivity to 0.5 ppm of NO2 gas with a response value of 336%, which was much higher than that of pure SnO2 (13%). In addition to the increase in the specific surface area of SnO2/ZnO-3 compared with pure SnO2, it also had a positive impact on the detection sensitivity. This increase was attributed to the heterojunction effect and the selective NO2 physisorption sensing mechanism of SnO2/ZnO nanocomposites. In addition, patterned electrodes of silver paste were printed on different flexible substrates, such as paper, polyethylene terephthalate and polydimethylsiloxane using a facile screen-printing process. Silver electrodes were integrated with SnO2/ZnO into a flexible wearable sensor array, which could detect 0.1 ppm NO2 gas after 10,000 bending cycles. The findings of this study therefore open a general approach for the fabrication of flexible devices for gas detection applications.

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Ultrahigh Sensitivity Micro-cliff Graphene Wearable Pressure Sensor Made by Instant Flash Light Exposure

Nanoscale ◽

10.1039/d1nr04333a ◽

2021 ◽

Author(s):

Yachu Zhang ◽

Han Lin ◽

Fei Meng ◽

Huai Liu ◽

David Mesa ◽

...

Keyword(s):

Health Monitoring ◽

Pressure Sensor ◽

Biomedical Applications ◽

Light Exposure ◽

Pressure Sensors ◽

High Sensitivity ◽

Fast Response ◽

Highly Sensitive ◽

Ultrahigh Sensitivity ◽

Sensitive Pressure

Wearable and highly sensitive pressure sensors are of great importance for robotics, health monitoring and biomedical applications. Simultaneously achieving high sensitivity within a broad working range, fast response time (within...

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A highly sensitive and selective “turn-on” fluorescent probe for detection of fleroxacin in human serum and urine based on a lanthanide functionalized metal–organic framework

Dalton Transactions ◽

10.1039/c9dt03830b ◽

2019 ◽

Vol 48 (48) ◽

pp. 17945-17952 ◽

Cited By ~ 8

Author(s):

Tian-Yu Liu ◽

Xiang-Long Qu ◽

Bing Yan

Keyword(s):

Human Serum ◽

Metal Organic Framework ◽

High Sensitivity ◽

Luminescent Probe ◽

Turn On ◽

Highly Sensitive ◽

Sensitivity And Selectivity ◽

Metal Organic ◽

Serum And Urine

A novel luminescent probe based on a Eu3+ functionalized MOF hybrid (Eu3+@1) with high sensitivity and selectivity has been proved to possess enormous potential for the determination of fleroxacin in human serum and urine.

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Fast-Response Smart Self-Assembling Biosensors for Biomarker Detection

Volume 9: Mechanical Systems and Control, Parts A, B, and C ◽

10.1115/imece2007-42100 ◽

2007 ◽

Author(s):

James C. K. Lai ◽

Marco P. Schoen ◽

Arya Ebrahimpour ◽

Alok Bhushan ◽

Christopher K. Daniels ◽

...

Keyword(s):

Functional Characterization ◽

High Sensitivity ◽

Fast Response ◽

Biomarker Detection ◽

Dual Purpose ◽

Self Assembling ◽

Highly Sensitive ◽

Multiple Biomarkers ◽

The One ◽

The Ideal

The development of biosensors has been astronomical with the advent of the rapid growth of nanomaterials and nanotechnology. Nanobiosensors are becoming ubiquitous in numerous biomedical applications. Thus, there is a great impetus to exploit smart nanoparticles and other nanomaterials for designing and fabricating smart nanobiosensors that are ultrasensitive and biocompatible. We are developing smart self-assembling biosensors that can detect specific biomolecules (e.g., enzymes, cofactors, metabolites, drugs, hormones, etc.) from micro- to nanomolar levels. Applications of the biosensors include detection of organ dysfunction and/or failure (e.g., liver malfunction, heart failure, etc.), early detection of malignant cancers, toxicant identification, and other biomarkers of diseases. Although nanobiosensors that possess high sensitivity and specificity have been designed and marketed, one fundamental issue remains to be resolved. This important issue is one concerning biocompatibility. Thus, in our development of smart biosensors using nanomaterials, we have adopted a dual purpose approach. (i) On the one hand, it is necessary to systematically and comprehensively evaluate the material properties, characterize and model the signal sensing ability, and determine the biocompatibility of materials to be employed for the design of nanobiosensors. (ii) On the other hand, it is imperative to identify the ideal criteria for the designs of fast-response smart self-assembling nanobiosensors for biomarker detection. Based on a critical review of the literature and consideration of the biocompatibility, functional characterization, and other related issues discussed above, we have identify a set of criteria for the design of fast-response smart self-assembling nanobiosensors for detection of multiple biomarkers. We have also identified many biomedical areas where such nanobiosensors can be applied to detect biomarkers for various diseases. Our dual purpose approach will ultimately lead to the design of much more biocompatible and highly sensitive nanobiosensors and diagnostic equipment (nanobiosensor arrays).

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A novel and highly sensitive electrochemical monitoring platform for 4-nitrophenol on MnO2 nanoparticles modified graphene surface

RSC Advances ◽

10.1039/c5ra14471j ◽

2015 ◽

Vol 5 (108) ◽

pp. 88996-89002 ◽

Cited By ~ 14

Author(s):

Shabi Abbas Zaidi ◽

Jae Ho Shin

Keyword(s):

Electrochemical Sensor ◽

High Sensitivity ◽

Graphene Surface ◽

Mno2 Nanoparticles ◽

Highly Sensitive ◽

Sensitivity And Selectivity ◽

Modified Graphene ◽

Electrochemical Monitoring ◽

Monitoring Platform

A novel, simple fabrication of a 4-nitrophenol (4-NP) electrochemical sensor using MnO2 nanoparticles modified graphene with high sensitivity and selectivity.

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Potentiometric Signal Transduction for Selective Determination of 1-(3-Chlorophenyl)piperazine “Legal Ecstasy” Through Biomimetic Interaction Mechanism

Chemosensors ◽

10.3390/chemosensors7030046 ◽

2019 ◽

Vol 7 (3) ◽

pp. 46

Author(s):

Eman El-Naby

Keyword(s):

Dynamic Range ◽

Limit Of Detection ◽

Interaction Mechanism ◽

High Sensitivity ◽

Fast Response ◽

Polymeric Membrane ◽

Selective Determination ◽

Sensitivity And Selectivity ◽

Pharmacologically Active

1-(3-chlorophenyl)piperazine (mCPP) is a wide spread new psychoactive substance produces stimulant and hallucinogenic effects similar to those sought from ecstasy. Hence, in the recent years, mCPP has been introduced by the organized crime through the darknet as a part of the illicit ecstasy market with a variable complex profile of pharmacologically active substances that pose problematic risk patterns among people who take these seized products. Accordingly, the design of selective sensors for the determination of mCPP is a very important demand. In this respect, a supramolecular architecture; [Na(15-crown-5)][BPh4] from the assembly of 15-crown-5 and sodium tetraphenylboron has been utilized as an ionophore, for the first time in the selective recognition of mCPP in conjunction with potassium tetrakis(p-chlorophenyl)borate and dioctylphthalate through polymeric membrane ion sensors. The ionophore exhibited a strong binding affinity that resulted in a high sensitivity with a slope closed to the ideal Nernstian value; 58.9 ± 0.43 mV/decade, a larger dynamic range from 10−6 to 10−2 M, a lower limit of detection down to 5.0 × 10−7 M and a fast response time of 5 s. Very important also is it was afforded excellent selectivity towards mCPP over psychoactive substances of major concern, providing a potentially useful system for the determination of mCPP in the illicit market. On comparison with the natural β-cyclodextrin as an ionophore, it exhibited more sensitivity and selectivity estimated to be the superior.

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