Interrupted Energy Transfer: Highly Selective Detection of Cyclic Ketones in the Vapor Phase

Cox, Jason R.; Müller, Péter; Swager, Timothy M.

doi:10.1021/ja202277h

Cited by 61 publications

(49 citation statements)

References 18 publications

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“…The second component is a thiourea receptor that is known to bind to ketones via two point hydrogen bonding and has been used to detect cyclohexanone previously. (20,23) The third component is a triethoxysilane (TES) group that reacts to creates a polymer network structure and also reacts with hydroxyl groups on the surface of glass (24) thereby immobilizing both the SWCNT and receptors to produce a highly stable device. Sensory devices are produced by dispersing SWCNTs and a selector ( Figure 1a) with ultrasonication in tetrahydrofuran (THF) and then dropcasting the solution between two gold electrodes separated by 300 µm.…”

Section: Resultsmentioning

confidence: 99%

Robust Cyclohexanone Selective Chemiresistors Based on Single-Walled Carbon Nanotubes

Frazier

Swager

2013

Anal. Chem.

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Functionalized single-walled carbon nanotube (SWCNT)-based chemiresistors are reported for a highly robust and sensitive gas sensor to selectively detect cyclohexanone, a target analyte for explosive detection. The trifunctional selector has three important properties: it noncovalently functionalizes SWCNTs with cofacial π-π interactions, it binds to cyclohexanone via hydrogen bond (mechanistic studies were investigated), and it improves the overall robustness of SWCNT-based chemiresistors (e.g., humidity and heat). Our sensors produced reversible and reproducible responses in less than 30 s to 10 ppm of cyclohexanone and displayed an average theoretical limit of detection (LOD) of 5 ppm.

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Section: Resultsmentioning

confidence: 99%

Robust Cyclohexanone Selective Chemiresistors Based on Single-Walled Carbon Nanotubes

Frazier

Swager

2013

Anal. Chem.

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“…1C). 23,45 This electron is transferred to the acceptor, and the acceptor then transfers to an electron back to the donor. The electron comes from the HOMO of the acceptor, so the acceptor is left in an excited state.…”

Section: Electron Exchange or Dexter Interactionsmentioning

confidence: 99%

“…The good selectivity was possibly due to a subtle balance of receptor specificity and the ability of analytes to partition into the polymer matrix. 45 Compared with the parent PPE 1, those polymers showed a manifestly higher quenching sensitivity toward DNT in chloroform, however, a slower quenching response to DNT than TNT vapor in the thin film, suggesting that the solid-state sensitivity might be 58 Compared to the control polymer of PPE, the solution-casted thin films from these new polymers, poly(pyrene-co-phenyleneethynylene)s, showed dramatically enhanced quenching response to TNT in aqueous medium as shown in Fig. 6.…”

Section: Organic Conjugated Polymers 311 Poly(phenylene Ethynylene)smentioning

confidence: 99%

Fluorescence based explosive detection: from mechanisms to sensory materials

2015

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The detection of explosives is one of the current pressing concerns in global security. In the past few decades, a large number of emissive sensing materials have been developed for the detection of explosives in vapor, solution, and solid states through fluorescence methods. In recent years, great efforts have been devoted to develop new fluorescent materials with various sensing mechanisms for detecting explosives in order to achieve super-sensitivity, ultra-selectivity, as well as fast response time. This review article starts with a brief introduction on various sensing mechanisms for fluorescence based explosive detection, and then summarizes in an exhaustive and systematic way the state-of-the-art of fluorescent materials for explosive detection with a focus on the research in the recent 5 years. A wide range of fluorescent materials, such as conjugated polymers, small fluorophores, supramolecular systems, bio-inspired materials and aggregation induced emission-active materials, and their sensing performance and sensing mechanism are the centerpiece of this review. Finally, conclusions and future outlook are presented and discussed.

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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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Interrupted Energy Transfer: Highly Selective Detection of Cyclic Ketones in the Vapor Phase

Cited by 61 publications

References 18 publications

Robust Cyclohexanone Selective Chemiresistors Based on Single-Walled Carbon Nanotubes

Robust Cyclohexanone Selective Chemiresistors Based on Single-Walled Carbon Nanotubes

Fluorescence based explosive detection: from mechanisms to sensory materials

Wireless gas detection with a smartphone via rf communication

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