Detection of Liquid Organic Solvents on Metal Oxide Nanostructure Decorated Porous Silicon Interfaces

Baker, Caitlin; Gole, James L.

doi:10.1021/acssensors.5b00075

Cited by 10 publications

(8 citation statements)

References 21 publications

(92 reference statements)

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“…We have extended our gas phase studies and demonstrated liquid phase organic solvent detection at moderate temperatures [16]. In this monograph we compare our sensor platform to solid state metal oxide sensors.…”

Section: The Interfacementioning

confidence: 96%

Nanostructure directed interfaces created from nanoparticle island sites deposited to microporous arrays and forming sensor platforms

Gole¹,

Laminack²,

Boudreaux³

2017

Front Nanosci Nanotech

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Novel nanostructured island sites are made to decorate a microporous/nanoporous array. These island sites are formed from a variety of easily produced nanostructured metal oxides deposited from solution. Sensor platforms are distinct from and do not require film-based coating. The nanostructure directing acidic metal oxide sites which vary in their Lewis acidity decorate micropores and control the electron transduction process. The interaction of analytes with these island sites varies in a predictable manner and can be modified through in-situ functionalization of their Lewis acidity. The microporous structure allows rapid Fickian diffusion of analytes to the active nanostructure island sites whose reversible interaction dominates the sensor response as it requires low energy consumption. Highly accurate repeat depositions are not required. We require that the island sites are deposited at sufficiently low concentration so as not to interact electronically with each other. The response time of these interfaces is more rapid than film-based depositions, which require a more lengthy diffusion time. The sensors are reversible. The nanoporous structure prevents sintering of these island centers at elevated temperatures. The concentration of detection centers can be made to produce an optimum matrix of enhanced sensor responses, force a dominant distinct analyte-interface physisorption (rather than chemisorption). The produced semiconductor interface is easily functionalized to create an enhanced range of nanoparticle semiconductor sites. The matrix provides a sensitive means of transferring electrons that are easily detected. The sensors operate at room temperature as well as elevated temperatures. Low energy magnetic field signal enhancement can be achieved with transition metals. Contaminated sensors can be readily rejuvenated. Pulsed mode operation ensures low analyte consumption and high analyte selectivity and further provides the ability to rapidly assess false positive signals using Fast Fourier Transfer techniques, Solar pumped sensors requiring low light levels (≤ 1 Watt) have been demonstrated. Water vapor contamination can be greatly if not entirely reduced. The modelling of sensor response with a new Fermi energy distribution -based response isotherm is found to be superior to other isotherms. Sensors operate can be made to operate efficiently for two gases simultaneously. Modes of extending these studies to multiple gas arrays are considered.

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Section: The Interfacementioning

confidence: 96%

Nanostructure directed interfaces created from nanoparticle island sites deposited to microporous arrays and forming sensor platforms

Gole¹,

Laminack²,

Boudreaux³

2017

Front Nanosci Nanotech

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“…It was established that organic solvents have a clear effect on the impedance spectra of PSi sensors. According to Baker and Gole, the distinction between the responses to various organic solvents is correlated with the dipole moments of the organic molecules, suggesting the dominance of dipole–dipole interactions associated with the observed responses.…”

Section: Approaches To Optimization Of Psi‐based Gas and Vapor Sensorsmentioning

confidence: 98%

“…Gole and coworkers believe that sensor arrays based on the use of both p‐type and n‐type doping combined with a variety of distinct metal oxide depositions on similarly prepared PSi platforms can offer the additional possibility of gas recognition, complimenting the abovementioned approach based on choosing pore size, porosity, and morphology of the porous silicon layer (PSL).…”

Section: Approaches To Optimization Of Psi‐based Gas and Vapor Sensorsmentioning

confidence: 99%

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How to Improve the Performance of Porous Silicon‐Based Gas and Vapor Sensors? Approaches and Achievements

Rusu

2019

Physica Status Solidi (a)

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It is shown that, along with the advantages, sensors based on porous silicon (PSi) have disadvantages that inhibit their widespread use. The parameters of PSi which can affect the performance of PSi-based sensors are considered in detail, and approaches are analyzed that allow for the improvement of the main characteristics of PSi-based gas and vapor sensors. It is concluded that despite the progress made in terms of improving the sensitivity, selectivity, and stability of PSi-based sensors, further research and development in this direction is necessary, as the existing methods do not provide the required stability of the characteristics and selectivity of their response.

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“…The nature of liquid sensing has been completely reevaluated [29]. The responsiveness of PS sensor systems is superior to other metal oxide systems.…”

Section: Technology Featuresmentioning

confidence: 99%

New Generation Devices for Gas (Liquid) Sensing

Jl¹,

Laminack²

2016

J Phys Chem Biophys

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Detection of Liquid Organic Solvents on Metal Oxide Nanostructure Decorated Porous Silicon Interfaces

Cited by 10 publications

References 21 publications

Nanostructure directed interfaces created from nanoparticle island sites deposited to microporous arrays and forming sensor platforms

Nanostructure directed interfaces created from nanoparticle island sites deposited to microporous arrays and forming sensor platforms

How to Improve the Performance of Porous Silicon‐Based Gas and Vapor Sensors? Approaches and Achievements

New Generation Devices for Gas (Liquid) Sensing

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