High-yield photolytic generation of brominated single-walled carbon nanotubes and their application for gas sensing

Hines, D.P.; Rümmeli, Mark H.; Adebimpe, D.; Akins, Daniel L.

doi:10.1039/c4cc03702b

Cited by 22 publications

(24 citation statements)

References 42 publications

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“…Sequential injection of NO 3 − , Cl − , and AcO − (2 µL each) in each sensor gives different sensitivity transitions, wherein AcO − induces high sensitivity change while lower sensitive transitions were observed toward Cl − and NO 3 − . The drift of the response signal was observed during the sensing of multiple anions, which was mainly attributed to the swelling of SWCNTs and P4VP in the organic solvent . Further optimization should be performed by controlling the coating thickness of P4VP‐ 2 ‐SWCNT to mitigate signal drift.…”

Section: Resultsmentioning

confidence: 99%

Chemiresistors for the Real‐Time Wireless Detection of Anions

Choi

Yoon

Ray

et al. 2019

Adv Funct Materials

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Reported is an electrical transduction platform for real‐time wireless anion sensing using single‐walled carbon nanotubes (SWCNTs) noncovalently functionalized with squaramide‐based anion binding selectors. Systematically studied are anion‐binding properties and efficiency of the electrical transduction of the functionalized SWCNT composites using the squaramide‐based selectors with two similar electron‐withdrawing groups, 3,5‐bis(trifluoromethyl)benzyl (1) and 3,5‐bis(trifluoromethyl)phenyl (2), which induce hydrogen‐bonding interaction with anions and deprotonation of a squaramide N–H proton upon addition of acetate (AcO−), respectively. Charge transduction occurs with AcO− as a result of charge transfer from the deprotonated selector 2, whereas less sensitive transduction is observed with selector 1 via hydrogen‐bonding interaction. These results provide guidelines to efficiently transduce the chemical interaction between selectors and anions to create resistive transduction with functionalized SWCNTs. Electron‐withdrawing groups adjacent to the squaramide as well as proximate cationic pyridyl groups, enhance the anion binding affinity and also lower the selector's pKa. The chemiresistive sensor arrays are readily integrated with a wireless sensing module and demonstrated real‐time sensing of multiple anions with a smartphone readout.

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Section: Resultsmentioning

confidence: 99%

Chemiresistors for the Real‐Time Wireless Detection of Anions

Choi

Yoon

Ray

et al. 2019

Adv Funct Materials

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“…However, the drawback of using pure SWNTs as sensing element, is their lock of affinity to certain vapors, making them quite inert. Functionalizing SWNT is a means of structurally modifying the framework of such material, which may leads to improving the physical and chemical properties, [2][3][4] consequently becoming important in the selectivity and specificity needs in various application purposes. Functionalizing SWNTs enables us to exploit to certain degrees, the thermal, mechanical, electronic and optical properties of CNTs 4, 5 providing tremendous potential for a wide variety of applications in the field of biomedical [6][7][8] and material 9 sciences, theses likely to include polymeric solar cells, membrane fuel cells, 10 polymer composites [11][12][13] and sensors.…”

Section: Introductionmentioning

confidence: 99%

“…However, disadvantages of some of these devices ranges from sensitivity to temperature and humidity, complex interface and reproducibility, and their need for use in controlled environment, hence, providing the opportunity for continued research with carbon nanotubes. Carbon nanotubes comprise a range of semiconducting and metallic properties and can experience the ease of non-covalent 16 and covalent functionalization 4,17,18 are suitable for chemisensor use in e-Noses. A cohort of functionalized SWNTs rationalized on the basis of covalent chemical modification to impart electron-donating or electron-withdrawing functionalities at defect sites have been synthesized and characterized.…”

Section: Introductionmentioning

confidence: 99%

Nanomolecular gas sensor architectures based on functionalized carbon nanotubes for vapor detection

et al. 2015

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There is enormous interest in detection of simple & complex odors by mean of electronic instrumentation. Specifically, our work focuses on creating derivatized-nanotube-based "electronic noses" for the detection and identification of gases, and other materials. We have grafted single-walled carbon nanotubes (SWNTs) with an array of electron-donating and electron withdrawing moieties and have characterized some of the physicochemical properties of the modified nanotubes. Gas sensing elements have been fabricated by spin coating the functionalized nanotubes onto interdigitated electrodes (IDE's), creating an array of sensors. Each element in the sensor array can contain a different functionalized matrix. This facilitates the construction of chemical sensor arrays with high selectivity and sensitivity; a methodology that mimics the mammalian olfactory system. Exposure of these coated IDEs to organic vapors and the successful classification of the data obtained under DC monitoring, indicate that the system can function as gas sensors of high repeatability and selectivity for a wide range of common analytes. Since the detection of explosive materials is also of concern in this research, our next phase focuses on explosives such as, TNT, RDX, and Triacetone Triperoxide (TATP). Sensor data from individual detection are assessed on their own individual merits, after which they are amalgamated and reclassified to present each vapor as unique data point on a 2-dimensional map and with minimum loss of information. This approach can assist the nation's need for a technology to defeat IEDs through the use of methods that detect unique chemical signatures associated with explosive molecules and byproducts.

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“…Acetic acid vapor also decreased conductivity in previous CNT network chemiresistive sensors. 31,32 As a result, this sensor is selective for formic acid and stronger acids over acetic acid. This selectivity (and reversibility of the response) make CNT/ 1 chemiresistors unique from sensors based on strong Brønsted bases, which would be irreversible and not distinguish between various carboxylic acids.…”

mentioning

confidence: 96%

“…Networks of covalently-modified CNTs have been reported to increase in resistance, non-selectively, on exposure to acetic acid or other volatile organics via a swelling mechanism. 31,32 Studies on CNT-based vapor sensors discriminating between formic and other carboxylic acids are lacking.…”

mentioning

confidence: 99%

Carbon Nanotube Formic Acid Sensors Using a Nickel Bis(ortho-diiminosemiquinonate) Selector

Lin

Swager

2018

ACS Sens.

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Formic acid is corrosive and a sensitive and selective sensor could be useful in industrial, medical, and environmental settings. We present a chemiresistor for detection of formic acid comprised of single-walled carbon nanotubes and nickel bis(ortho-diiminosemiquinonate) (1)—a planar metal complex that can act as a ditopic hydrogen-bonding selector. Formic acid is detected in concentrations as low as 83 ppb. The resistance of the material decreases on exposure to formic acid, but slightly increases on exposure to acetic acid. We propose that 1 assists in partial protonation of the CNT by formic acid, but the response toward acetic acid is dominated by inter-CNT swelling. This technology establishes CNT-based chemiresistive discrimination between formic and acetic acid vapors.

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High-yield photolytic generation of brominated single-walled carbon nanotubes and their application for gas sensing

Cited by 22 publications

References 42 publications

Chemiresistors for the Real‐Time Wireless Detection of Anions

Chemiresistors for the Real‐Time Wireless Detection of Anions

Nanomolecular gas sensor architectures based on functionalized carbon nanotubes for vapor detection

Carbon Nanotube Formic Acid Sensors Using a Nickel Bis(ortho-diiminosemiquinonate) Selector

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