Organic Vapor Sensing with Ionic Liquids Entrapped in Alumina Nanopores on Quartz Crystal Resonators

Goubaidoulline, Ilchat; Vidrich, and Gabriele; Johannsmann, Diethelm

doi:10.1021/ac048436a

Cited by 53 publications

(43 citation statements)

References 18 publications

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“…The structure of this ionic liquid was characterized with NMR and element analysis. The elemental analysis for this ionic liquid ͑C: 25.54, H: 4.82, N: 9.08, and Zn: 6.50%͒ is consistent with the calculated value for C 20 The electrochemical behavior of Zn͑NH 2 -C 4 H 9 ͒ 4 2+ -2Tf 2 N − ionic liquid was also investigated with the cyclic voltammogram recorded on the glassy carbon electrode ͑Fig. 3͒.…”

Section: J10supporting

confidence: 81%

A New Strategy for Synthesis of Novel Classes of Room-Temperature Ionic Liquids Based on Complexation Reaction of Cations

Huang

Luo

Dai

2006

J. Electrochem. Soc.

107

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A novel series of ionic liquids have been synthesized with a new methodology. The essence of this methodology is to form the cations of ionic liquids through the complexation reactions of neutral organic ligands with metal ions, followed by the subsequent metathesis reactions of the resulting salts with anion donors. We chose N-lithiotrifluoromethanesulfonimide ͑Li + Tf 2 N − ͒ as a candidate for anion donors because Tf 2 N − anions have high thermal stabilities and weakly coordinating properties, which are crucial to the generation of less viscous and more hydrophobic ionic liquids. The transition-metal ions chosen in our investigation are Ag + and Zn 2+ . The uses of these ionic liquids as the new electrolytes for electrodeposition have been demonstrated.Room-temperature ionic liquids ͑RTILs͒ are defined as salts that melt below room temperature. 1-7 The most commonly studied classes of RTILs usually include a heterocyclic cation, such as dialkyl imidazolium or N-alkylpyridinium. These organic cations, which are relatively large and asymmetric compared with simple inorganic cations, account for the low melting points of the resulting salts. 8-10 A variety of anions can be utilized to form RTILs, including BF 4 − , PF 6 − , AlCl 4 − , Al 2 Cl 7 − , or other complex anions. 1,2 Such ionic systems consisting of salts that are liquids at the ambient temperature can act as solvents for a broad spectrum of chemical species. These ionic liquids are attracting increased attention as reaction solvents because of their remarkable properties, including negligible vapor pressures, high thermal stabilities, and high ionic conductivities. 1,2,5 The use of ionic liquids for separation processes, 11-17 sensing of volatile organic vapors and temperatures, 18-21 and synthesizing novel materials 22-25 has also been investigated.The conventional formation of ionic liquids can be regarded as the complexation reactions of simple anionic species by neutral compounds. 1,2 The most classic example is the formation of the ionic liquids made of 1-ethyl-3-methylimidazolium chloride ͑EMI + Cl − ͒ and aluminum chloride ͑AlCl 3 ͒. When two solids are mixed stoichiometrically, the complexation of Cl − by AlCl 3 gives rise to an RTIL composed of EMI + AlCl 4 − ͑Eq. 1͒ ͓1͔The reaction is exothermic, resulting in the release of heat. Similarly, the formation of EMI + BF 4 − can be hypothetically conceived through a reaction of EMI + F − and BF 3 . 8 Here, we report another strategy for synthesizing ionic liquids through the complexation reactions of metal cations by small neutral ligands. The systems we chose to demonstrate the basic principle of our strategy consist of neutral organic amine ligands and metallorganic salts.The essence of our new methodology is to form the cations of ionic liquids through the complexation reactions of neutral organic ligands with metal ions, followed by the subsequent metathesis reactions of the resulting salts with anion donors. 9,10 We chose N-lithiotrifluoromethanesulfonimide ͑Li + Tf 2 N − ͒ as a candidate fo...

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Section: J10supporting

confidence: 81%

A New Strategy for Synthesis of Novel Classes of Room-Temperature Ionic Liquids Based on Complexation Reaction of Cations

Huang

Luo

Dai

2006

J. Electrochem. Soc.

107

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“…Initially, GC stationary phases were employed as selective chemical sensing coatings to detect organic volatile solvent [3,4]. Later, numerous new applications with various coating materials such as supramolecular compounds [5][6][7][8][9][10][11][12][13][14], organic polymers [15][16][17][18][19], biomolecules [20,21], and ionic liquids (ILs) [22][23][24][25][26] followed. Some reviews on sensing materials have been published [27,28].…”

Section: Introductionmentioning

confidence: 99%

Ionic liquids used as QCM coating materials for the detection of alcohols

Pei

et al. 2008

Sensors and Actuators B: Chemical

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“…In one such example, ILs are trapped as nanodroplets into the cylindrical cavities of a solid alumina matrix, thus avoiding liquid wetting and softness. 96 Although this matrix can hold more IL than a planar gold surface, the detection limits were yet not low enough for the selected analytes. By contrast, conducting polymers (CPs) and polyelectrolytes have charges, which make them ideal template materials to make IL-composite films.…”

Section: Transducers For Il Based Gas Sensingmentioning

confidence: 99%

Methods and approaches of utilizing ionic liquids as gas sensing materials

Rehman

Zeng

2015

RSC Adv.

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Gas monitoring is of increasing significance for a broad range of applications in the fields of environmental and civil infrastructures, climate and energy, health and safety, industry and commerce. Even though there are many gas detection devices and systems available, the increasing needs for better detection technologies that not only satisfy the high analytical standards but also meet additional device requirements (e.g., being robust to survive under field conditions, low cost, small, smart, more mobile), demand continuous efforts in developing new methods and approaches for gas detection. Ionic Liquids (ILs) have attracted a tremendous interest as potential sensing materials for the gas sensor development. Being composed entirely of ions and with a broad structural and functional diversity, i.e., bifunctional (organic/inorganic), biphasic (solid/liquid) and dual-property (solvent/electrolyte), they have the complementing attributes and the required variability to allow a systematic design process across many sensing components to enhance sensing capability especially for miniaturized sensor system implementation. The emphasis of this review is to describe molecular design and control of IL interface materials to provide selective and reproducible response and to synergistically integrate IL sensing materials with low cost and low power electrochemical, piezoelectric/QCM and optical transducers to address many gas detection challenges (e.g., sensitivity, selectivity, reproducibility, speed, stability, cost, sensor miniaturization, and robustness). We further show examples to justify the importance of understanding the mechanisms and principles of physicochemical and electrochemical reactions in ILs and then link those concepts to developing new sensing methods and approaches. By doing this, we hope to stimulate further research towards the fundamental understanding of the sensing mechanisms and new sensor system development and integration, using simple sensing designs and flexible sensor structures both in terms of scientific operation and user interface that can be miniaturized and interfaced with modern wireless monitoring technologies to achieve specifications heretofore unavailable on current markets for the next generation of gas sensor applications.

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Organic Vapor Sensing with Ionic Liquids Entrapped in Alumina Nanopores on Quartz Crystal Resonators

Cited by 53 publications

References 18 publications

A New Strategy for Synthesis of Novel Classes of Room-Temperature Ionic Liquids Based on Complexation Reaction of Cations

A New Strategy for Synthesis of Novel Classes of Room-Temperature Ionic Liquids Based on Complexation Reaction of Cations

Ionic liquids used as QCM coating materials for the detection of alcohols

Methods and approaches of utilizing ionic liquids as gas sensing materials

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