Differentiation of Gas Molecules Using Flexible and All-Carbon Nanotube Devices

Fu, Dongliang; Lim, Hueiling; Shi, Yumeng; Dong, Xiaochen; Mhaisalkar, Subodh; Chen, Yuan; Moochhala, Shabbir; Li, Lain‐Jong

doi:10.1021/jp710362r

Cited by 82 publications

(68 citation statements)

References 23 publications

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“…Sensors without iron porphyrin-both pristine (not shown) and functionalized (black curve) SWCNTsshowed negligible responses to CO, which was consistent with the previous reports. [18][19][20]27] Sensors with iron porphyrin showed dosimetric responses indicating irreversibility over the experimental time frame. Pristine SWCNTs (lacking the 4-pyridyl anchor group) when treated with Fe(tpp)ClO 4 (green curve) showed a modest response (−0.57 ± 0.09%).…”

Section: Author Manuscript Author Manuscriptmentioning

confidence: 99%

“…[8,9] Although detectors for CO are available, there remains a need for massively [16,17] Theoretical and experimental reports have suggested that CO does not engage in charge transfer with pristine SWCNTs, [18][19][20] indicating the a chemical reactive interface is necessary. Conductivity-based CO detection has been reported for carboxylate-containing, [19] deformed, [21] or doped SWCNTs, [22] as well as SWCNTs dispersed in polymers [23] or decorated with metallic nanoparticles. [24] Alternatively, nonchemiresistive examples of SWCNT CO detectors rely on other mechanisms including changes in capacitance [25] and resonant frequency.…”

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confidence: 99%

“…[10][11][12][13][14][15] Random networks of functionalized SWCNTs have produced sensors that are inexpensive to fabricate, operate at room temperature, and have ultra-low power requirements. [16,17] Theoretical and experimental reports have suggested that CO does not engage in charge transfer with pristine SWCNTs, [18][19][20] indicating the a chemical reactive interface is necessary. Conductivity-based CO detection has been reported for carboxylate-containing, [19] deformed, [21] or doped SWCNTs, [22] as well as SWCNTs dispersed in polymers [23] or decorated with metallic nanoparticles.…”

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confidence: 99%

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Bio‐Inspired Carbon Monoxide Sensors with Voltage‐Activated Sensitivity

Savagatrup

Schroeder

et al. 2017

Angewandte Chemie

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Correspondence to: Timothy M. Swager. + These authors contributed equally to this work.Supporting information and the ORCID identification number(s) for the author(s) of this article can be found under: https://doi.org/ 10.1002/anie.201707491. Conflict of interestThe authors declare the following competing financial interest(s): A patent has been filed on this technology. HHS Public Access Author Manuscript Author ManuscriptAuthor Manuscript Author ManuscriptCarbon monoxide (CO) outcompetes oxygen when binding to the iron center of hemeproteins, leading to a reduction in blood oxygen level and acute poisoning. Harvesting the strong specific interaction between CO and the iron porphyrin provides a highly selective and customizable sensor. We report the development of chemiresistive sensors with voltage-activated sensitivity for the detection of CO comprising iron porphyrin and functionalized single-walled carbon nanotubes (F-SWCNTs). Modulation of the gate voltage offers a predicted extra dimension for sensing. Specifically, the sensors show significant increase in sensitivity toward CO when negative gate voltage is applied. The dosimetric sensors are selective to ppm levels of CO and functional in air. UV/Vis spectroscopy, differential pulse voltammetry, and density functional theory reveal that the in situ reduction of Fe III to Fe II enhances the interaction between the F-SWCNTs and CO. Our results illustrate a new mode of sensors wherein redox active recognition units are voltageactivated to give enhanced and highly specific responses. CommunicationsRevving up for sensing: A platform for voltage-activated, chemiresistive gas detection has been delveloped based on covalently functionalized single-walled carbon nanotubes decorated with voltage-responsive chemical selectors. The sensor is highly selective towards CO in the presence of oxygen, nitrogen, and carbon dioxide and is robust to humidity and remains operational in air. KeywordsCarbon monoxide; carbon nanotubes; iron porphyrin; sensors; voltage-activated Carbon monoxide (CO) is responsible for more than half of all fatal poisoning worldwide. [1] Exposure to the colorless, tasteless, and odorless gas is difficult to discern as the initial symptoms of poisoning (headache, dizziness, and confusion) are nonspecific. In the United States, the Occupational Safety and Health Administration (OSHA) has designated permissible exposure limits of 50 ppm over eight hours and 200 ppm over five minutes. [2] The affinity of iron porphyrin towards CO is well-documented for the enzymes cytochrome P450, [3][4][5] hemoglobin, [6] and myoglobin. [7] This high affinity for CO over O 2 of hemoglobin and myoglobin is the underlying mechanism of carbon monoxide poisoning in mammals. [8,9] Although detectors for CO are available, there remains a need for massively [16,17] Theoretical and experimental reports have suggested that CO does not engage in charge transfer with pristine SWCNTs, [18][19][20] indicating the a chemical reactive interface is necessary. Conductivity...

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Section: Author Manuscript Author Manuscriptmentioning

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Bio‐Inspired Carbon Monoxide Sensors with Voltage‐Activated Sensitivity

Savagatrup

Schroeder

et al. 2017

Angewandte Chemie

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“…Carboxylic acid group and defect sites may be formed on SWNT sidewalls as a result of purification steps, and interaction with CO molecules likely occurred. 20 Consequently, the COOH functionality and defect sites may play a key role in CO detection, resulting in a decrease in the electrical resistance of CNTs, despite the interaction with the holedonating gas. The CO sensing mechanism of PANI is not yet clear, but two plausible explanations have been proposed.…”

Section: Methodsmentioning

confidence: 99%

Gas Sensing performance of composite materials using conducting polymer/single-walled carbon nanotubes

Choi

Lee

Dong³

et al. 2012

Macromol. Res.

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We report the fabrication of a novel gas sensor that utilizes electrical resistance changes in electrically conductive polyaniline (PANI) and single-walled carbon nanotube (SWNT) composite materials and its sensing property when NH 3 and CO gases co-existed. In addition, we investigated the concentration dependence of electrical properties of the PANI/SWNT composite material at room temperature using real-time monitoring. To improve the gas sensor properties, we deposited PANI using a drop-casting method to warp the PANI surrounding the SWNT. The PANI/SWNT composite material sensors showed a faster response to NH 3 gas than CO gas. The CO gas increased the composite conductance, while the NH 3 gas had the opposite effect.

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“…In 2000, Dai and co-workers demonstrated the potential of SWCNT-based gas sensor to NO 2 and NH 3 at room temperature [8], which inspired researchers to widely explore CNTs for gas sensors. SWCNTs have been considered promising candidates for gas sensing applications, which can detect toxic gases, such as NO 2 , NH 3 , O 2 , H 2 , CO 2 and CO [11][12][13]. Recently, in order to improve the sensing performance of these SWCNT-based sensors, many sensing materials such as conducting polymers [14,15], metals [16], and metal oxides [17] have been anchored on the surface of SWCNTs, and play important roles in the improvement of the sensitivity and selectivity of the resultant gas sensors.…”

Section: Introductionmentioning

confidence: 99%

Copper phthalocyanine noncovalent functionalized single-walled carbon nanotube with enhanced NH3 sensing performance

Wang

et al. 2014

Sensors and Actuators B: Chemical

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Differentiation of Gas Molecules Using Flexible and All-Carbon Nanotube Devices

Cited by 82 publications

References 23 publications

Bio‐Inspired Carbon Monoxide Sensors with Voltage‐Activated Sensitivity

Bio‐Inspired Carbon Monoxide Sensors with Voltage‐Activated Sensitivity

Gas Sensing performance of composite materials using conducting polymer/single-walled carbon nanotubes

Copper phthalocyanine noncovalent functionalized single-walled carbon nanotube with enhanced NH3 sensing performance

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