Exploring fiber optic approach to sense humid environment over nano-crystalline zinc oxide film

Shukla, Shipra; Tiwari, Ashutosh; Parashar, G. K.; Mishra, Anoop Kumar; Dubey, G. C.

doi:10.1016/j.talanta.2009.07.026

Cited by 44 publications

(14 citation statements)

References 31 publications

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“…[ 46,47 ] The most common optical sensors take the form of optical fi bers coated with a reactive material, which changes the confi nement of the mode in response to RH. [ 33,47,51 ] These designs have response times ranging from 10 ms [ 48 ] to 0.5 min [ 49 ] and have resolutions up to 0.01%RH across a broad range. [ 33,47 ] In recent years, there has been a concerted drive to produce sensing elements that can be integrated with nano-and microscale optical circuitry, to comply with lab-on-a-chip devices and other emerging technologies.…”

Section: Full Paper Full Paper Full Papermentioning

confidence: 99%

Plasmonic Gas Sensing Using Nanocube Patch Antennas

Powell

Coles

Taylor

et al. 2016

Advanced Optical Materials

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of interest and be as sensitive as possible to small changes in the local environment. While individual particle resonances can be effectively tuned through size, shape and material choice, [ 2,12 ] coupled modes between two or more nanoparticles have been shown to exhibit far greater electric fi eld enhancements and produce more sensitive detectors. [13][14][15][16][17][18] However, these are extremely diffi cult to fabricate, with many top-down lithographic and FIBbased examples being unrealistic for scaling up, and bottom-up techniques that generally produce randomly oriented particle pairs with no control over the alignment, which is key as the resonances of such dimers are highly sensitive to the polarization of incident illumination. Henzie et al. made some important progress in this fi eld by using a gravity-driven technique to assemble nanoparticles in shallow pits in a substrate, which allows excellent control over orientation and positioning of any number of particle sets. [ 19 ] Another elegant solution to the fabrication problem is the placement of a metallic particle above a metal sheet separated by a thin spacer. A "mirror particle" is excited in the metal plane, which produces a strong coupling effect without having to align two separate particles, drastically simplifying the production process. [ 22 ] There is a growing body of work investigating the properties of silver nanocubes (NCs) above metal fi lms, to tune their scattering properties, [ 21 ] produce controlled-refl ectance surfaces, [ 22 ] and to control and enhance the radiative processes of fl uorophores within the spacer material, [ 23,24 ] as well as theoretical studies looking to build a complete description of the structure. [ 25,26 ] This system can be considered an optical patch antenna, where gap plasmon modes are supported between the metal sheet and the NC. [ 21 ] The resonant modes of these antennae are extremely sensitive to the properties of the spacer layer separating the NC and the silver sheet, and any environmental changes that infl uence the refractive index (RI), or more importantly the thickness of the chosen material will produce signifi cant changes in the plasmon resonance. As long as spacer materials which expand in response to a given analyte are available, this design can be utilized to detect any number of chemicals. This forms the basis for a new type of sensor, which can operate equally well in a gaseous or liquid setting (depending on spacer choice) and that is scalable from the sub-wavelength scale (the footprint of one nanocube) up to a large-surface area metamaterial.In this paper, we demonstrate the operation of the nanocube patch antenna system as a gas sensor for the fi rst time, usingThe ability of individual nanocube patch antennas, consisting of a silver nanocube separated from an Ag sheet by a thin fl uoropolymer spacer, to act as subwavelength sensing elements is demonstrated. An increase in relative humidity (RH) causes the spacer to expand, which alters the resonance of the plasmon cavity mode fo...

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confidence: 99%

Plasmonic Gas Sensing Using Nanocube Patch Antennas

Powell

Coles

Taylor

et al. 2016

Advanced Optical Materials

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“…To detect humidity changes and to convert the humidity measurements into electric or optical signals, a variety of humidity-sensing technologies have been developed, such as resistive and capacitive sensors, gravimetric sensors, optics, and surface acoustic wave technology . In addition, many sensing materials have also been discovered or synthesized for humidity detection, such as carbon, − metal oxides, − two-dimensional materials, − and polymers. − Among these methods and materials, polymer-based resistive humidity sensors possess the advantages of a simple structure, easy preparation, low cost, high sensitivity, rapid response, and compatibility with modern integrated circuit technology and, therefore, have been used widely.…”

Section: Introductionmentioning

confidence: 99%

Highly Responsive PEG/Gold Nanoparticle Thin-Film Humidity Sensor via Inkjet Printing Technology

Chiu

Chen

et al. 2019

Langmuir

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In this study, a highly responsive humidity sensor is developed by printing gold nanoparticles (GNPs) grafted with a hygroscopic polymer. These GNPs are inkjet-printed to form a uniform thin film over an interdigitated electrode with a controllable thickness by adjusting the printing parameters. The resistance of the printed GNP thin film decreases significantly upon exposure to water vapor and exhibits a semi-log relationship with relative humidity (RH). The sensor can detect RH variations from 1.8 to 95% with large resistance changes up to 4 orders of magnitude with no hysteresis and small temperature dependence. In addition, with a small thickness, the sensor can reach absorption equilibrium quickly with response and recovery times of ≤1.2 and ≤3 s, respectively. The fast response to humidity changes also allows the GNP thin-film sensor to distinguish signals from intermittent humidification/dehumidification cycles with a frequency up to 2.5 Hz. The printed sensors on flexible substrates show little sensitivity to bending deformation and can be embedded in a mask for human respiratory detection. In summary, this study demonstrates the feasibility of applying printing technology for the fabrication of thin-film humidity sensors, and the methodology developed can be further applied to fabricate many other types of nanoparticle-based sensor devices.

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“…Electrically conducting polymers represent an important class of materials with potential applications in a number of devices such as electrode materials in energy storage devices, sensor technology, shielding of equipment from electromagnetic interference, solar cells, anticorrosive materials, wastewater treatment etc. One of the most important applications of these materials which has been attracting considerable attention recently is dissipation of electrostatic charge…”

Section: Introductionmentioning

confidence: 99%

Development of polyaniline/zinc oxide nanocomposite impregnated fabric as an electrostatic charge dissipative material

et al. 2015

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The paper presents the electrostatic charge dissipative performance of conducting polymer nanocomposite impregnated fabric based on polyaniline (PANI) and zinc oxide nanoparticles (ZnO NPs). Conducting polymer nanocomposites (PANI‐ZnO NPs) were synthesized by in situ chemical oxidative polymerization of aniline by using sodium dodecyl sulfate as surfactant and HCl as dopant. Coating of PANI‐ZnO nanocomposites on the cotton fabric was carried out during polymerization. The interaction of ZnO NPs with the PANI matrix was determined by Fourier transform infrared spectra (FTIR), TGA, XRD, scanning electron Microscopy (SEM), high resolution transmission electron microscopy (HRTEM) and conductivity measurements. The conductivity of PANI‐ZnO NP coated fabric was found to be in the range 10−3 − 10−6 S cm−1 depending on the loading concentration of ZnO NPs in the polymer matrix. TEM and HRTEM images showed that the PANI‐ZnO nanocomposites had an average diameter of 25–30 nm and were nicely dispersed in the polymer matrix. Antistatic performance of the nanocomposite impregnated fabric was investigated by static decay meter and John Chubb instrument. The static decay time of the film was in the range 0.5 − 3.4 s on recording the decay time from 5000 V to 500 V. This indicated that the nanocomposite based on PANI‐ZnO nanocomposites has great potential to be used as an effective antistatic material. © 2015 Society of Chemical Industry

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Exploring fiber optic approach to sense humid environment over nano-crystalline zinc oxide film

Cited by 44 publications

References 31 publications

Plasmonic Gas Sensing Using Nanocube Patch Antennas

Plasmonic Gas Sensing Using Nanocube Patch Antennas

Highly Responsive PEG/Gold Nanoparticle Thin-Film Humidity Sensor via Inkjet Printing Technology

Development of polyaniline/zinc oxide nanocomposite impregnated fabric as an electrostatic charge dissipative material

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