Polymers in sensor applications

Adhikari, Balakrishna

doi:10.1016/s0079-6700(04)00038-3

Cited by 28 publications

(41 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The years in the last decade have also witnessed consistent efforts by researchers in improving the physical and structural properties of CPs. 1,[5][6][7][8][9][10][11][12] The physical and structural attributes of CPs are generally affected by crucial parameters such as polymerization method, type of the oxidant, pH and temperature conditions during polymerization, etc. In recent times, however, tuning of CPs' properties has also been attempted by use of nanomaterials.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Polypyrrole/Metal Sulphide Hybrid Nanocomposites: Synthesis, Characterization and Room Temperature Gas Sensing Properties

et al. 2016

View full text Add to dashboard Cite

The present research work explores the room temperature gas sensing ability of hybrid nanocomposites of metal sulphide nanoparticles with polypyrrole (PPy) matrix. Sonochemically synthesized both silver sulphide (Ag 2 S) and cadmium sulphide (CdS) nanoparticles were mixed in varying ratios with PPy matrix by in-situ oxidative polymerization route. The resulting PPy/(Ag 2 S:CdS) hybrid nanocomposites were analyzed by characterizing them using FTIR and UV-Visible spectroscopy, XRD, SEM, fourprobe conductivity method and gas sensing ability by two-probe gas sensing setup. The current-voltage (I-V) characteristics of the PPy hybrid nanocomposites revealed their semiconducting nature with an electrical conductivity in the range of 10 −4 to 10 −3 S/cm. As compared to pure PPy, their hybrid PPy/ (Ag 2 S:CdS) nanocomposites showed an enhancement in sensitivity towards ammonia gas detection. The results clearly indicated a synergistic effect between the Ag 2 S:CdS nanoparticles and the PPy matrix.

show abstract

Section: Introductionmentioning

confidence: 99%

“…[7][8][9][21][22][23] Bulk production of PPy is also possible by oxidative polymerization of pyrrole in aqueous or non-aqueous media. Various methods and routes have been successfully used to prepare PPy and their nanostructures.…”

Section: Introductionmentioning

confidence: 99%

Polypyrrole/Metal Sulphide Hybrid Nanocomposites: Synthesis, Characterization and Room Temperature Gas Sensing Properties

et al. 2016

View full text Add to dashboard Cite

show abstract

“…Polymer nanowires have better mechanical flexibility compared to semiconductor nanowires and they are biocompatible materials which can have different functional dopants (Adhikari and Majumdar 2004;Viphavakit et al 2014b). Their fabrication process can be simpler than those of glass nanowires.…”

Section: Introductionmentioning

confidence: 99%

Surface plasmon resonance-enhanced light interaction in an integrated ormocomp nanowire

et al. 2016

View full text Add to dashboard Cite

An integrated ormocomp nanowire coated with gold metal layer is proposed and its optical characteristics with the effect of surface plasmon resonance (SPR) are studied. The integrated rib-like nanowire has a trapezoidal shape with sidewall angles of 75°. It is coated with 50 nm gold layer to introduce the SPR and enhance the evanescent field in the sensing region located at the dielectric/metal interface. The possible field modes, the normalized power confinement, and the SPR peak position of the nanowire are studied over the wavelength and the metal thickness by using the full-vectorial H-field FEM in quasi-TM mode. The attenuation coefficient of the nanowire, the SPR peak wavelength, and the wavelength shift is experimentally extracted for three different cladding materials. The redshift of the supermode coupling between the dielectric mode and the anti-symmetric supermode is observed with the higher cladding-index and larger metal thickness. The improvement of the power confinement in the sensing region with the SPR effect is ten times (109) better than a previous similar study.

show abstract

“…Most of sensing applications use polymers. 7 This is because their physical properties (e.g. volume) or chemical properties (e.g.…”

Section: Introductionmentioning

confidence: 99%

“…As a result, cost of the MEMS system reduces and the sensitivity of the sensor is enhanced. Ion-sensitive 7,14 (ii) PVC (structure is shown in Figure 3) (i) A SPE of 10% PVC, 3% TBAHPF) and 87% of NPOE…”

Section: Introductionmentioning

confidence: 99%

Review of polymer-based sensors for agriculture-related applications

Palaparthy¹,

Baghini²,

Singh³

2013

Emerging Materials Research

View full text Add to dashboard Cite

Advancements in micro-electro-mechanical system (MEMS) and nano-electro-mechanical system (NEMS) technologies IntroductionIn agriculture, soil plays an important role in the overall yield of crop production. Although it is expected to enhance the yield by applying fertilizers, lack or excess levels of soil nutrients should be monitored. In general, for optimal control of soil conditions, it is necessary to measure nutrient content, moisture and pH levels, air humidity, temperature and composition of the soil at regular intervals. It is important to test the soil parameters to determine fertility, expected growth potential of the soil and measure nutrient deficiencies. 'pH' level is a measure of the acidity or basicity of the soil. Soil temperature influences crop growth since seeds, plant roots and microorganisms within the soil will not survive below some threshold temperature. Knowledge of soil humidity is important because it affects water-related reactions in the plants such as photosynthesis, pollination and even occurrence of plant diseases.1 Soil monitoring will also be useful for providing the basis for productions from soil such as food as well as controlling and regulating environmental interactions and sustaining biodiversity. Advancements in micro-electro-mechanical systems (MEMS) and nano-electro-mechanical systems (NEMS) as well as development of various chemical compounds has led to various methods and techniques for health monitoring and study of the soil. MEMS structures may be simple with no moving parts or be extremely complex with multiple moving elements under the control of integrated circuits. NEMS are next-generation MEMS devices, which are mainly in the nanometer scale. As a result, they are of low mass, high mechanical resonance frequencies, potentially large quantum mechanical effects such as zero-point motion, and a high surface-to-volume ratio that is useful for surface-based sensing mechanism.3 Figure 1 shows the structure of two commonly used MEMS structures: MEMS SU-8 polymer cantilever and MEMS microheater having suspended serpentine silicon beam as filament. 4,5 In this article, the authors present a review on reported polymers that are used for sensing various nutrients (which are also found in the soil) such as soil moisture, pH value and humidity. A polymer is

show abstract

Polymers in sensor applications

Cited by 28 publications

References 0 publications

Polypyrrole/Metal Sulphide Hybrid Nanocomposites: Synthesis, Characterization and Room Temperature Gas Sensing Properties

Polypyrrole/Metal Sulphide Hybrid Nanocomposites: Synthesis, Characterization and Room Temperature Gas Sensing Properties

Surface plasmon resonance-enhanced light interaction in an integrated ormocomp nanowire

Review of polymer-based sensors for agriculture-related applications

Contact Info

Product

Resources

About