Highly Sensitive Detection of Naphthalene in Solvent Vapor Using a Functionalized PBG Refractive Index Sensor

Girschikofsky, Maiko; Rosenberger, M.; Belle, Stefan; Brutschy, Malte; Waldvogel, Siegfried R.; Hellmann, Ralf

doi:10.3390/s120202018

Cited by 24 publications

(14 citation statements)

References 20 publications

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“…However, we have recently shown that PLD deposited, porous WO3 performs similarly well on a MOS sensor platform [39]. In comparison to an optochemical naphthalene sensor described in [40], our sensor exhibits about 10 times longer response times (10 min vs. 1 min), but an at least 100 times lower detection limit (5 ppb vs. 500 ppb).…”

Section: Discussionmentioning

confidence: 75%

Exploring the selectivity of WO 3 with iridium catalyst in an ethanol/naphthalene mixture using multivariate statistics

et al. 2016

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Temperature cycled operation and multivariate statistics have been used to compare the selectivity of two gate (i.e. sensitive) materials for gas-sensitive, silicon carbide based field effect transistors towards naphthalene and ethanol in different mixtures of the two substances. Both gates have a silicon dioxide (SiO2) insulation layer and a porous iridium (Ir) electrode. One of it has also a dense tungsten trioxide (WO3) interlayer between Ir and SiO2. Both static and transient characteristics play an important role and can contribute to improve the sensitivity and selectivity of the gas sensor. The Ir/SiO2 is strongly influenced by changes in ethanol concentration, and is, thus, able to quantify ethanol in a range between 0 and 5 ppm with a precision of 500 ppb, independently of the naphthalene concentrations applied in this investigation. On the other hand, this sensitivity to ethanol reduces its selectivity towards naphthalene, whereas Ir/WO3/SiO2 shows an almost binary response to ethanol. Hence, the latter has a better selectivity towards naphthalene and can quantify legally relevant concentrations down to 5 ppb with a precision of 2.5 ppb, independently of a changing ethanol background between 0 and 5 ppm.

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Section: Discussionmentioning

confidence: 75%

Exploring the selectivity of WO 3 with iridium catalyst in an ethanol/naphthalene mixture using multivariate statistics

et al. 2016

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“…By connecting a single mode (SM) fiber to the PBGs using UV curable glue, both gratings could be simultaneously monitored during the experiments. A detailed description of the fabrication process of the PBGs can be found elsewhere . Figure illustrates the structure of the planar sensor chip, including a cross‐section indicating the interaction of the evanescent field with a surrounding medium.…”

Section: Methodsmentioning

confidence: 99%

Surface functionalization allowing repetitive use of optical sensors for real‐time detection of antibody‐bacteria interaction

Kutscher

Rosenberger

Schmauß

et al. 2015

Journal of Biophotonics

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In this study, sensor surface functionalization allowing the repetitive use of a sensing device was evaluated for antibody-based detection of living bacteria using an optical planar Bragg grating sensor. To achieve regenerable immobilization of bacteria specific antibodies, the heterobifunctional cross-linker N-succinimidyl 3-(2-pyridyldithio) propionate (SPDP) was linked to an aminosilanized sensor surface and subsequently reduced to expose sulfhydryl groups enabling the covalent conjugation of SPDP-activated antibodies via disulfide bonds. The immobilization of a capture antibody specific for Staphylococcus aureus on the sensor surface as well as specific binding of S. aureus could be monitored, highlighting the applicability of optical sensors for the specific detection of large biological structures. Reusability of bacteria saturated sensors was successfully demonstrated by cleaving the antibody along with bound bacteria through reduction of disulfide bonds and subsequent re-functionalization with activated antibody, resulting in comparable sensitivity towards S. aureus.

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“…Such an optical device could be a Bragg grating sensor [12]. The field of application for such sensors includes temperature, pressure and strain sensing [12] or chemical analyses [13,14]. Previous works using conventional PMMA instead of hybrid polymers already proved that a change of the refractive index can be achieved by excimer laser irradiation of the polymer [15].…”

Section: Introductionmentioning

confidence: 99%

Hybrid polymers processed by substrate conformal imprint lithography for the fabrication of planar Bragg gratings

et al. 2016

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Within this work, we present an approach to use UV-enhanced substrate conformal imprint lithography (UV-SCIL) as a soft imprint technique combined with excimer laser irradiation to manufacture Bragg gratings within planar waveguides on a full wafer scale. For the first time, different hybrid polymers (OrmoComp®, OrmoStamp, OrmoCore, OrmoClad and OrmoClear) could be successfully patterned using UV-SCIL. For OrmoComp® (showing results very similar to OrmoStamp and OrmoClad) a complete imprint process could be realized. OrmoCore formed an inhibition layer in the presence of oxygen during the imprint, as could be observed for the use of OrmoClear as well. Processing options were elaborated to reduce the inhibition effect significantly, whereby the latter is mainly due to the atmospheric oxygen containing PDMS layer of the UV-SCIL working stamp. Further on, the successful realization of a planar Bragg grating operating at the telecom wavelength is demonstrated by tuning the refractive index (RI) of OrmoComp® using a phase mask and an UV excimer laser. FTIR-measurements show that the change in refractive index can be clearly correlated with a change in the chemical composition of the hybrid polymer during laser exposure

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Highly Sensitive Detection of Naphthalene in Solvent Vapor Using a Functionalized PBG Refractive Index Sensor

Cited by 24 publications

References 20 publications

Exploring the selectivity of WO 3 with iridium catalyst in an ethanol/naphthalene mixture using multivariate statistics

Exploring the selectivity of WO 3 with iridium catalyst in an ethanol/naphthalene mixture using multivariate statistics

Surface functionalization allowing repetitive use of optical sensors for real‐time detection of antibody‐bacteria interaction

Hybrid polymers processed by substrate conformal imprint lithography for the fabrication of planar Bragg gratings

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