A selective SAW-based organophosphonate chemical sensor employing a self-assembled, composite monolayer:  a new paradigm for sensor design

Kepley, Larry J.; Crooks, Richard M.; Ricco, Antonio J.

doi:10.1021/ac00048a018

Cited by 169 publications

(128 citation statements)

References 10 publications

Supporting

Mentioning

122

Contrasting

Unclassified

Order By: Relevance

“…The ability to tailor the monolayer-air interface makes SAMs ideal model systems for studies of interfacial phenomena. Potential applications of these systems include sensors [8], corrosion inhibitors [9], molecular recognition [10], and molecular crystal growth [11]. Real applications of these systems require precise control of structural features [12].…”

Section: Introductionmentioning

confidence: 99%

Structure and dynamics of monolayers on planar and cluster surfaces

Pradeep

Sandhyarani

2002

Pure and Applied Chemistry

View full text Add to dashboard Cite

Organized molecular assemblies have been one of the intensely pursued areas of contemporary chemistry. Among the various methodologies used to make organized monolayer structures, self-assembled monolayers (SAMs) have been attractive to many materials chemists owing to the simplicity of the preparative method and high stability. Advances in various techniques and their application in the study of SAMs have significantly improved our understanding of these molecular systems. These studies have been further intensified since the successful preparation of stable metal clusters protected with monolayers. This article reviews the structure, temperature-induced phase transitions, and associated dynamics of monolayers, principally in the context of our own work in this area. Alkanethiols on Au (111) and Ag(111) are taken as archetypal systems to discuss the properties of 2D SAMs; studies from our laboratory have been on evaporated thin films. Alkanethiols on Au and Ag cluster surfaces are taken as examples of 3D SAMs. Although our principal focus will be on alkanethiols, we will touch upon a few other adsorbate systems as well.

show abstract

Section: Introductionmentioning

confidence: 99%

Structure and dynamics of monolayers on planar and cluster surfaces

Pradeep

Sandhyarani

2002

Pure and Applied Chemistry

View full text Add to dashboard Cite

show abstract

“…Previous FTIR-ERS and X-ray photoelectron spectroscopy measurements of similarly prepared composite monolayer films have confirmed the formation of the (COO-),/Cu" interface. [16][17][18] The last material studied was a modified cyclodextrin (3-0-butanoyl-2,6-di-O-n-pentyl-ycyclodextrin, CD) a so-called cage compound, synthesized by the group of Prof. Schurig at the Institute of Organic Chemistry of the University of Tubingen, Germany;l9 a detailed description of the synthetic procedures can be found elsewhere. 20 The CD was spray coated onto the devices using an airbrush.…”

Section: Methodsmentioning

confidence: 99%

“…The SAW and FTIR-ERS data shown in Figures 4A and 4B for a Cu2"/MUAfunctionalized SAW device demonstrate the sensitivity of our measurements, which provide a basis to study interactions between composite monolayer films and gas-phase adsorbates. [16][17][18] Although our SAW measurements are sensitive to approximately 100 pg/cm2, typical absorbances for organic monolayer films are on the order of lo", and therefore FTIR-ERS requires a high degree of instrumental sensitivity and stability as well as measurement repeatability.8 The measured absorbance intensity may diminish further under conditions that enlarge the focal beam and reduce the spectral resolution. A typical signal-to-noise ratio in FTIR-ERS measurements is comparable to that of transmission infrared analysis.8…”

mentioning

confidence: 98%

Reflectance Infrared Spectroscopy on Operating Surface Acoustic Wave Chemical Sensors during Exposure to Gas-Phase Analytes

Hierlemann¹,

Mj²,

Ricco³

et al. 1999

Anal. Chem.

Self Cite

View full text Add to dashboard Cite

We have developed instrumentation to enable the combination of surface acoustic wave (SAW) sensor measurements with direct, in-situ molecular spectroscopic measurements to understand the response of the SAW sensors with respect to the'interfacial chemistry of surface-confined sensing films interacting with gas-phase analytes. Specifically, the instrumentation and software was developed to perform in-situ Fourier-transform infrared external-reflectance spectroscopy (FTIR-ERS) on operating SAW devices during dosing of their chemically modified surfaces with analytes. By probing the surface with IR spectroscopy during gas exposure, it is possible to understand in unprecedented detail the interaction processes between the sorptive SAW coatings and the gaseous analyte molecules. In this report, we provide details of this measurement system, and also demonstrate the utility of these combined measurements by characterizing the SAW and FTIR-ERS responses of organic thin-film sensor coatings interacting with gas-phase analytes.

show abstract

“…Measurement of the resonance frequency shift ∆f allowed us to estimate the surface coverage due to molecular adsorption [18][19][20].…”

Section: Chemical Detection Measurementsmentioning

confidence: 99%

“…A number of gravimetric based transducers have been used as platforms for detecting phosphorous containing organic compounds. An earlier study [18] has used a SAW device with self-assembled monolayers to derive selectivity and reversibility. In the present studies we exposed DIMP directly to gold-coated microcantilevers both for simplicity and because gold reflects most of the incoming IR energy minimizing direct heating of the substrate.…”

Section: Dimpmentioning

confidence: 99%

Microsensors for In-Situ, Real-Time Detection and Characterization of Toxic Organic Substances

Rajic¹

2001

View full text Add to dashboard Cite

A selective SAW-based organophosphonate chemical sensor employing a self-assembled, composite monolayer: a new paradigm for sensor design

Cited by 169 publications

References 10 publications

Structure and dynamics of monolayers on planar and cluster surfaces

Structure and dynamics of monolayers on planar and cluster surfaces

Reflectance Infrared Spectroscopy on Operating Surface Acoustic Wave Chemical Sensors during Exposure to Gas-Phase Analytes

Microsensors for In-Situ, Real-Time Detection and Characterization of Toxic Organic Substances

Contact Info

Product

Resources

About