Porous Graphene Oxide–Metal Ion Composite for Selective Sensing of Organophosphate Gases

Shauloff, Nitzan; Teradal, Nagappa L.; Jelinek, Raz

doi:10.1021/acssensors.9b02367

Cited by 32 publications

(25 citation statements)

References 46 publications

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“…To construct the calibration curves, the results were quantified based on peak area using the extracted ion method performed by Masshunter qualitative analysis software. The target peak assignments were confirmed with the pure materials [29]. Analyte vapors were measured in different flow rates and examined using GC-MS in injection mode.…”

Section: Gas Chromatography-mass Spectrometrymentioning

confidence: 91%

“…To prepare the C-dot-IDE capacitive electrodes, we utilized a recently developed protocol [ 29 ]. Briefly, C-dot suspensions in water (2 mg mL −1 ) were sonicated for 5 min, drop-casted (15 µL) on the interdigitated electrodes (IDEs) and left to dry overnight under room temperature.…”

Section: Methodsmentioning

confidence: 99%

“…The gas apparatus setup for vapor generation and sensing (Scheme S1) was based on a recent publication [ 29 ]. Briefly, for the vapor sensing experiments, we used an inert gas carrier-dry nitrogen, split into two components: one carrier flow bubbling through the volatile organic compounds (n-hexane, toluene, dimethylformamide, ethyl acetate, methanol, ammonium) at variable rates.…”

Section: Methodsmentioning

confidence: 99%

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Sniffing Bacteria with a Carbon-Dot Artificial Nose

et al. 2021

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Highlights Novel artificial nose based upon electrode-deposited carbon dots (C-dots). Significant selectivity and sensitivity determined by “polarity matching” between the C-dots and gas molecules. The C-dot artificial nose facilitates, for the first time, real-time, continuous monitoring of bacterial proliferation and discrimination among bacterial species, both between Gram-positive and Gram-negative bacteria and between specific strains. Machine learning algorithm furnishes excellent predictability both in the case of individual gases and for complex gas mixtures. Abstract Continuous, real-time monitoring and identification of bacteria through detection of microbially emitted volatile molecules are highly sought albeit elusive goals. We introduce an artificial nose for sensing and distinguishing vapor molecules, based upon recording the capacitance of interdigitated electrodes (IDEs) coated with carbon dots (C-dots) exhibiting different polarities. Exposure of the C-dot-IDEs to volatile molecules induced rapid capacitance changes that were intimately dependent upon the polarities of both gas molecules and the electrode-deposited C-dots. We deciphered the mechanism of capacitance transformations, specifically substitution of electrode-adsorbed water by gas molecules, with concomitant changes in capacitance related to both the polarity and dielectric constants of the vapor molecules tested. The C-dot-IDE gas sensor exhibited excellent selectivity, aided by application of machine learning algorithms. The capacitive C-dot-IDE sensor was employed to continuously monitor microbial proliferation, discriminating among bacteria through detection of distinctive “volatile compound fingerprint” for each bacterial species. The C-dot-IDE platform is robust, reusable, readily assembled from inexpensive building blocks and constitutes a versatile and powerful vehicle for gas sensing in general, bacterial monitoring in particular.

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Section: Gas Chromatography-mass Spectrometrymentioning

confidence: 91%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Sniffing Bacteria with a Carbon-Dot Artificial Nose

et al. 2021

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“…Due to their special electrical, optical, and thermal properties, graphene added composite materials have been extensively studied for different energy conversion and sensing applications. [173][174][175][176][177][178][179][180][181][182] A simple schematic illustration on the formation of graphene covered grains in the bulk is shown in Fig. 16.…”

Section: Secondary Phase At Grain Boundariesmentioning

confidence: 99%

Core–shell nanostructures for better thermoelectrics

Mulla

Dunnill

2022

Mater. Adv.

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“…The aforementioned efforts include microstructuring (micropyramid and microcone structures) of PDMS using laser patterning techniques. , However, fabrication of these microstructures is often complex and not suitable for mass production. In addition, microporous PDMS structures have been developed using sacrificial three-dimensional (3D) templates. − The 3D templates are typically made by mixing PDMS with the sacrificial materials such as salt/sugar and base chemicals. When the 3D templates are treated with either water or acids, the sacrificial materials dissolve, resulting in the creation of micropores in the PDMS.…”

mentioning

confidence: 99%

Highly Sensitive Porous PDMS-Based Capacitive Pressure Sensors Fabricated on Fabric Platform for Wearable Applications

et al. 2021

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A novel porous polydimethylsiloxane (PDMS)-based capacitive pressure sensor was fabricated by optimizing the dielectric layer porosity for wide-range pressure sensing applications in the sports field. The pressure sensor consists of a porous PDMS dielectric layer and two fabric-based conductive electrodes. The porous PDMS dielectric layer was fabricated by introducing nitric acid (HNO3) into a mixture of PDMS and sodium hydrogen bicarbonate (NaHCO3) to facilitate the liberation of carbon dioxide (CO2) gas, which induces the creation of porous microstructures within the PDMS dielectric layer. Nine different pressure sensors (PS1, PS2,..., PS9) were fabricated in which the porosity (pore size, thickness) and dielectric constant of the PDMS dielectric layers were varied by changing the curing temperature, the mixing proportions of the HNO3/PDMS concentration, and the PDMS mixing ratio. The response of the fabricated pressure sensors was investigated for the applied pressures ranging from 0 to 1000 kPa. A relative capacitance change of ∼100, ∼323, and ∼485% was obtained by increasing the curing temperature from 110 to 140 to 170 °C, respectively. Similarly, a relative capacitance change of ∼170, ∼282, and ∼323% was obtained by increasing the HNO3/PDMS concentration from 10 to 15 to 20%, respectively. In addition, a relative capacitance change of ∼94, ∼323, and ∼460% was obtained by increasing the PDMS elastomer base/curing agent ratio from 5:1 to 10:1 to 15:1, respectively. PS9 exhibited the highest sensitivity over a wide pressure sensing range (low-pressure ranges (<50 Pa), 0.3 kPa–1; high-pressure ranges (0.2–1 MPa), 3.2 MPa–1). From the results, it was observed that the pressure sensors with dielectric layers prepared at relatively higher curing temperatures, higher HNO3 concentrations, and higher PDMS ratios resulted in increased porosity and provided the highest sensitivity. As an application demonstrator, a wearable fit cap was developed using an array of 16 pressure sensors for measuring and mapping the applied pressures on a player’s head while wearing a helmet. The pressure mapping aids in observing and understanding the proper fit of the helmet in sports applications.

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Porous Graphene Oxide–Metal Ion Composite for Selective Sensing of Organophosphate Gases

Cited by 32 publications

References 46 publications

Sniffing Bacteria with a Carbon-Dot Artificial Nose

Sniffing Bacteria with a Carbon-Dot Artificial Nose

Core–shell nanostructures for better thermoelectrics

Highly Sensitive Porous PDMS-Based Capacitive Pressure Sensors Fabricated on Fabric Platform for Wearable Applications

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