Hybridized conducting polymer chemiresistive nano-sensors

Hangarter, Carlos M.; Chartuprayoon, Nicha; Hernández, Sandra C.; Choa, Yong‐Ho; Myung, Nosang V.

doi:10.1016/j.nantod.2012.12.005

Cited by 153 publications

(119 citation statements)

References 139 publications

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“…Thesensitivity observed for our material toward ammonia vapor is competitive with values reported for chemiresistive sensors based on pristine carbon nanotubes (CNTs) [34] and conductive polymers such as PEDOT, [35,36] as well as recently reported chemicals ensors based on transistors fabricated from monolayer 2D crystals of MoS 2 grown by chemical vapor deposition (CVD). [37] Furthermore,d etection of sub-ppm levels of ammonia is sufficient for air quality monitoring according to EPAg uidelines, [38] as well as for typical agriculture and livestock applications.…”

Section: Methodssupporting

confidence: 78%

Cu₃(hexaiminotriphenylene)₂: An Electrically Conductive 2D Metal–Organic Framework for Chemiresistive Sensing

et al. 2015

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The utility of metal-organic frameworks (MOFs) as functional materials in electronic devices has been limited to date by a lack of MOFs that display high electrical conductivity. Here, we report the synthesis of a new electrically conductive 2D MOF, Cu3(HITP)2 (HITP=2,3,6,7,10,11-hexaiminotriphenylene), which displays a bulk conductivity of 0.2 S cm(-1) (pellet, two-point-probe). Devices synthesized by simple drop casting of Cu3(HITP)2 dispersions function as reversible chemiresistive sensors, capable of detecting sub-ppm levels of ammonia vapor. Comparison with the isostructural 2D MOF Ni3(HITP)2 shows that the copper sites are critical for ammonia sensing, indicating that rational design/synthesis can be used to tune the functional properties of conductive MOFs.

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Section: Methodssupporting

confidence: 78%

Cu₃(hexaiminotriphenylene)₂: An Electrically Conductive 2D Metal–Organic Framework for Chemiresistive Sensing

et al. 2015

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“…Swelling mechanisms have been posited previously for both polymer-and CNT-based sensors. 2,3,23,24,26,27 We used Raman spectroscopy to examine the changes in the sensing material caused by analytes and found that while relative effects observed in this experiment did not clearly correlate with the magnitude of different responses, both ionic and neutral porphyrin-SWCNT composites exhibited changes in the relative intensities of the radial breathing mode (RBM) absorptions upon exposure to analytes, suggesting that analyte vapors induced changes in CNT-CNT interactions (see Supporting Information figures S9 and S10). 28,29 We observe inverted behavior for the ionic metalloporphyrin composite upon exposure to analyte as compared to the neutral case, a relative increase in the peak at 265 cm -1 rather than a decrease.…”

Section: Supporting Informationmentioning

confidence: 99%

Single-Walled Carbon Nanotube–Metalloporphyrin Chemiresistive Gas Sensor Arrays for Volatile Organic Compounds

2015

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A chemiresistive sensor array was created from single-walled carbon nanotubes (SWCNTs) by non-covalent modification with late first-row transition metal complexes of meso-tetraphenylporphyrin. The responses to vapors of various volatile organic compounds (VOCs) were strong and were subjected to statistical analyses that enabled the successful classification of representative VOCs into five different categories (aliphatic hydrocarbons, alcohols, ketones, aromatic hydrocarbons, and amines) with 98% accuracy. With the exception of amines, which are capable of strong charge transfer interactions, the basis of classification appears to correlate with the differences in the solubility properties of the porphyrin compounds in the various VOCs as solvents. This feature suggests that an analyte with greater intermolecular affinity for the SWCNT-porphyrin composite will induce a greater response. These results further demonstrate the potential for porphyrin-functionalized SWCNT-based electronic noses for applications in inexpensive, portable chemical sensors for the identification of VOCs.

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“…The nanopore-based single-molecule mechanistic studies are also beneficial for biosensor development 29 – 31 . For example, complementary nucleic acid hybridization is a fundamental biochemical process and has been extensively utilized in developing electrochemical-based 32 – 36 and fluorescence-based sensors 37 – 39 and nanosensors 40 – 42 . Recently, we have developed a probe-based nanopore approach for microRNA detection 24 , 43 , 44 .…”

Section: Introductionmentioning

confidence: 99%

Probing molecular pathways for DNA orientational trapping, unzipping and translocation in nanopores by using a tunable overhang sensor

et al. 2014

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Nanopores provide a unique single-molecule platform for genetic and epigenetic detection. The target nucleic acids can be accurately analyzed by characterizing their specific electric fingerprints or signatures in the nanopore. Here we report a series of novel nanopore signatures generated by target nucleic acids that are hybridized with a probe. A length-tunable overhang appended to the probe functions as a sensor to specifically modulate the nanopore current profile. The resulting signatures can reveal multiple mechanisms for the orientational trapping, unzipping, escaping and translocation of nucleic acids in the nanopore. This universal approach can be used to program various molecular movement pathways, elucidate their kinetics, and enhance the sensitivity and specificity of the nanopore sensor for nucleic acid detection.

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Hybridized conducting polymer chemiresistive nano-sensors

Cited by 153 publications

References 139 publications

Cu₃(hexaiminotriphenylene)₂: An Electrically Conductive 2D Metal–Organic Framework for Chemiresistive Sensing

Cu₃(hexaiminotriphenylene)₂: An Electrically Conductive 2D Metal–Organic Framework for Chemiresistive Sensing

Single-Walled Carbon Nanotube–Metalloporphyrin Chemiresistive Gas Sensor Arrays for Volatile Organic Compounds

Probing molecular pathways for DNA orientational trapping, unzipping and translocation in nanopores by using a tunable overhang sensor

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Hybridized conducting polymer chemiresistive nano-sensors

Cited by 153 publications

References 139 publications

Cu3(hexaiminotriphenylene)2: An Electrically Conductive 2D Metal–Organic Framework for Chemiresistive Sensing

Cu3(hexaiminotriphenylene)2: An Electrically Conductive 2D Metal–Organic Framework for Chemiresistive Sensing

Single-Walled Carbon Nanotube–Metalloporphyrin Chemiresistive Gas Sensor Arrays for Volatile Organic Compounds

Probing molecular pathways for DNA orientational trapping, unzipping and translocation in nanopores by using a tunable overhang sensor

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Cu₃(hexaiminotriphenylene)₂: An Electrically Conductive 2D Metal–Organic Framework for Chemiresistive Sensing

Cu₃(hexaiminotriphenylene)₂: An Electrically Conductive 2D Metal–Organic Framework for Chemiresistive Sensing