A novel composite film for detection and molecular weight determination of organic vapors

Regmi, Bishnu P.; Monk, Joshua; El‐Zahab, Bilal; Das, Susmita; Hung, Francisco R.; Hayes, Daniel J.; Warner, Isiah M.

doi:10.1039/c2jm31623d

Cited by 46 publications

(49 citation statements)

References 56 publications

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“…1 Colloidal nanoparticles prepared from GUMBOS are termed nanoGUMBOS and have been recently studied as candidates for photovoltaics, 2,3 biomedical imaging, 4 and molecular sensing. [5][6][7] Previously, we have reported on ultrafast excited-state dynamics of colloidal crystalline ruthenium bipyridine-bis(pentafluoroethylsulfonyl) imide ([Ru(bipy) 3 ]- [BETI] 2 ) that show spectral shifts and sizedependent relaxation dynamics. 3 These [Ru(bipy) 3 ]-[BETI] 2 nanoGUMBOS exhibit long-lived phonon oscillations with size-dependent frequencies that increase as the nanoparticle size increases due to very low coupling between electronic and phonon degrees of freedom and a strong hydrophobic interaction with the aqueous solvent.…”

Section: Introductionmentioning

confidence: 99%

Ultrafast and nonlinear spectroscopy of brilliant green-based nanoGUMBOS with enhanced near-infrared emission

Karam

Siraj

Zhang

et al. 2017

The Journal of Chemical Physics

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The synthesis, characterization, ultrafast dynamics, and nonlinear spectroscopy of 30 nm nanospheres of brilliant green-bis(pentafluoroethylsulfonyl)imide ([BG][BETI]) in water are reported. These thermally stable nanoparticles are derived from a group of uniform materials based on organic salts (nanoGUMBOS) that exhibit enhanced near-infrared emission compared with the molecular dye in water. The examination of ultrafast transient absorption spectroscopy results reveals that the overall excited-state relaxation lifetimes of [BG][BETI] nanoGUMBOS are longer than the brilliant green molecular dye in water due to steric hindrance of the torsional degrees of freedom of the phenyl rings around the central carbon. Furthermore, the second harmonic generation signal of [BG][BETI] nanoGUMBOS is enhanced by approximately 7 times and 23 times as compared with colloidal gold nanoparticles of the same size and the brilliant green molecular dye in water, respectively. A very clear third harmonic generation signal is observed from the [BG][BETI] nanoGUMBOS but not from either the molecular dye or the gold nanoparticles. Overall, these results show that [BG][BETI] nanoGUMBOS exhibit altered ultrafast and nonlinear spectroscopy that is beneficial for various applications including nonlinear imaging probes, biomedical imaging, and molecular sensing.

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Section: Introductionmentioning

confidence: 99%

Ultrafast and nonlinear spectroscopy of brilliant green-based nanoGUMBOS with enhanced near-infrared emission

Karam

Siraj

Zhang

et al. 2017

The Journal of Chemical Physics

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“…in the nanomolar range with higher selectivity than other common metal ions. In addition, an organic vapor-sensitive composite film comprising cellulose acetate and a representative compound 1-nbutyl-2,3-dimethylimidazolium hexafluorophosphate was developed using a solvent precipitation method by Regmi et al (2012).…”

Section: Esterified Cellulose Containing Aliphatic Moietiesmentioning

confidence: 99%

Functional nanomaterials through esterification of cellulose: a review of chemistry and application

et al. 2018

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As the most abundant biopolymer in nature, cellulose has become a fascinating building block for the design of functional nanomaterials. Owing to the presence of numerous hydroxyl groups, cellulose provides a unique platform for the preparation of new materials via versatile chemical modifications. This critical review aims to present the advances about nanomaterials based on cellulose derivatives with the focus on cellulose esters within the last two decades, including the chemistry and application of these nanostructured materials. This review starts with the introduction on first fundamental aspects about diverse esterification techniques used up to now to modify cellulose. The in situ esterification for the isolation of nanocelluloses and diverse post esterification methods of nanocelluloses for the surface functionalization were highlighted in the following description. Various esterification strategies and further nanostructure constructions have been developed aiming to confer specific properties to cellulose esters, extending therefore their feasibility for highly sophisticated applications, which were summarized with respect to the categories of the introduced ester moieties. Thus, this review assembles and emphasizes the state-of-art knowledge of functional nanomaterials derived from diverse esterified cellulose compounds.

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“…Composite materials were then created using an IL-polymer blend with the phosphonium ILs and polydimethylsiloxane (PDMS). PDMS is known to increase sensitivity of gas sensors [22], and IL-polymer blends have been shown to increase discrimination of VOCs due to enhanced viscoelastic properties [23,24]. In order to investigate the vapor sensing properties of each IL and IL-PDMS composite, thin films of each were deposited on the surface of QCRs via electrospray deposition and subsequently exposed to a set of five chlorinated VOCs.…”

Section: Introductionmentioning

confidence: 99%

Quartz Crystal Microbalance Based Sensor Arrays for Detection and Discrimination of VOCs Using Phosphonium Ionic Liquid Composites

Vaughan

Pérez

Chhotaray

et al. 2020

Sensors

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Herein, we examine two sensing schemes for detection and discrimination of chlorinated volatile organic compounds (VOCs). In this work, phosphonium ionic liquids (ILs) were synthesized and vapor sensing properties examined and compared to phosphonium IL-polymer composites. Pure IL sensors were used to develop a QCM-based multisensory array (MSA), while IL-polymer composites were used to develop an MSA and virtual sensor arrays (VSAs). It was found that by employing the composite MSA, five chlorinated VOCs were accurately discriminated at 95.56%, which was an increase in accuracy as compared to pure ILs MSA (84.45%). Data acquired with two out of three VSAs allowed discrimination of chlorinated VOCs with 100% accuracy. These studies have provided greater insight into the benefits of incorporating polymers in coating materials for enhanced discrimination accuracies of QCM-based sensor arrays. To the best of our knowledge, this is the first report of a QCM-based VSA for discrimination of closely related chlorinated VOCs.

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A novel composite film for detection and molecular weight determination of organic vapors

Cited by 46 publications

References 56 publications

Ultrafast and nonlinear spectroscopy of brilliant green-based nanoGUMBOS with enhanced near-infrared emission

Ultrafast and nonlinear spectroscopy of brilliant green-based nanoGUMBOS with enhanced near-infrared emission

Functional nanomaterials through esterification of cellulose: a review of chemistry and application

Quartz Crystal Microbalance Based Sensor Arrays for Detection and Discrimination of VOCs Using Phosphonium Ionic Liquid Composites

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