Robust Cyclohexanone Selective Chemiresistors Based on Single-Walled Carbon Nanotubes

Frazier, Kelvin M.; Swager, Timothy M.

doi:10.1021/ac400808h

Cited by 51 publications

(62 citation statements)

References 26 publications

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“…This paper introduces a concept for distributed chemical sensing by the growing number of people that carry NFC-enabled smartphones, tablets, and other smart devices. (17,19,20). HB pencil lead (P3) was chosen as a negative control because it shows a negligible response toward the concentrations of analytes used in this study.…”

Section: Fabrication and Characterization Of Cardsmentioning

confidence: 99%

Wireless gas detection with a smartphone via rf communication

Azzarelli

Mirica

Ravnsbæk

et al. 2014

Proc. Natl. Acad. Sci. U.S.A.

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142

103

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Chemical sensing is of critical importance to human health, safety, and security, yet it is not broadly implemented because existing sensors often require trained personnel, expensive and bulky equipment, and have large power requirements. This study reports the development of a smartphone-based sensing strategy that employs chemiresponsive nanomaterials integrated into the circuitry of commercial near-field communication tags to achieve non-line-of-sight, portable, and inexpensive detection and discrimination of gas-phase chemicals (e.g., ammonia, hydrogen peroxide, cyclohexanone, and water) at part-per-thousand and part-per-million concentrations.RFID | NFC | sensor | nanomaterials | wireless P ortable chemical sensors are needed to manage and protect the environment (1), human health (2, 3), and quality of life (4). Examples include sensors for point-of-care diagnosis of disease (5), detection of explosives and chemical warfare agents (6), indication of food ripening and spoilage (7), and monitoring of environmental pollution (1). Connecting sensors with information technology through wireless rf communication is a promising approach to enable cost-effective onsite chemical detection and analysis (8). Although rf technology has been recently applied toward wireless chemical sensing, current approaches have several limitations, including lack of specificity to selected chemical analytes, requirements for expensive, bulky, fragile, and operationally complex impedance and network analyzers, and reliance on extensive data processing and analysis (8-13). We report herein the adaptation of a nascent technology embedded in modern smartphones-near-field communication (NFC)-for wireless electronic, portable, non-line-of-sight selective detection of gasphase chemicals ( Fig. 1 and Fig. S1). We demonstrate this concept by (i) incorporating carbon-based chemiresponsive materials into the electronic circuitry of commercial NFC tags by mechanical drawing and (ii) using an NFC-enabled smartphone to relay information regarding the chemical environment (e.g., presence or absence of a chemical) surrounding the NFC tag. This paper illustrates the ability to detect and differentiate partper-million (ppm) concentrations of ammonia, cyclohexanone, and hydrogen peroxide. We demonstrate the ability to couple wireless acquisition and transduction of chemical information with existing smartphone functions [e.g., Global Positioning System (GPS)] (Movie S1).Many commercial smartphones and mobile devices are equipped with NFC hardware configured to communicate wirelessly with NFC "tags"-simple electrical resonant circuits comprising inductive (L), capacitive (C), and resistive (R) elements on a plastic substrate (Fig. 1). The smartphone, such as the Samsung Galaxy S4 (SGS4) used in this study, communicates with the battery-free tag by powering its integrated circuit (IC) via inductive coupling at 13.56 MHz (14). Power transferred from the smartphone to the IC is, among other variables, a function of the transmission frequency (f), the re...

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Section: Fabrication and Characterization Of Cardsmentioning

confidence: 99%

Wireless gas detection with a smartphone via rf communication

Azzarelli

Mirica

Ravnsbæk

et al. 2014

Proc. Natl. Acad. Sci. U.S.A.

Self Cite

142

103

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“…An estimated LOD of~0.15 ppm was achieved based on 2 min of exposure, which was well below the vapor pressure of cyclohexanone, which was~6500 ppm at 20 • C. The paper-based colorimetric sensor strip, reported herein, is ideal for the rapid headspace inspection of unknown samples in the field and superior to prior studies on cyclohexanone detection, in terms of the sensitivity. In comparison with the functionalized single-walled carbon nanotube (SWCNT)-based chemiresistors, developed by Swager et al [52] for similar applications, the current method was able to substantially improve LOD from 5 ppm to low sub-ppm level by slightly elongating the exposure time from 30 s to 2 min. Compared to the recent results of optical cyclohexanone sensing, using the same colorimetric probe but different host matrices (i.e., plasticized films, with neither significant microscale structure nor comparable surface areas), sensor response from organosilica microspheres was generally 30-50% higher for each concentration, and the reported sensitivity in current work was enhanced 4-5 times (0.15 ppm vs. 0.84 ppm) [53].…”

Section: Limit Of Detection and Specificitymentioning

confidence: 91%

Nanoporous Silica-Dye Microspheres for Enhanced Colorimetric Detection of Cyclohexanone

2018

Chemosensors

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Forensic detection of non-volatile nitro explosives poses a difficult analytical challenge. A colorimetric sensor comprising of ultrasonically prepared silica-dye microspheres was developed for the sensitive gas detection of cyclohexanone, a volatile marker of explosives 1,3,5-trinitro-1,3,5-triazinane (RDX) and 1,3,5,7-tetranitro-1,3,5,7-tetrazocane (HMX). The silica-dye composites were synthesized from the hydrolysis of ultrasonically sprayed organosiloxanes under mild heating conditions (150 • C), which yielded microspherical, nanoporous structures with high surface area (~300 m 2 /g) for gas exposure. The sensor inks were deposited on cellulose paper and given sensitive colorimetric responses to trace the amount of cyclohexanone vapors even at sub-ppm levels, with a detection limit down to~150 ppb. The sensor showed high chemical specificity towards cyclohexanone against humidity and other classes of common solvents, including ethanol, acetonitrile, ether, ethyl acetate, and ammonia. Paper-based colorimetric sensors with hierarchical nanostructures could represent an alternative sensing material for practical applications in the detection of explosives.

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“…To increase selectivity towards a certain target molecules and reduce cross-sensitivity to other interfering species, carbons in gas sensors are often functionalised [32][33][34][35][36] or incorporated into a composite material 3,[37][38][39][40][41] .…”

Section: Introductionmentioning

confidence: 99%