Geometric design optimization of polyaniline/graphite nanocomposite based flexible humidity sensor for contactless sensing and breath monitoring

Dutta, Achintya; Nirmale, Aditya; Nayak, Ramakrishna; Selvakumar, M.; Bhat, Somashekara; Paramasivam, Selvaraj; Kumar, Sunil

doi:10.1016/j.matlet.2022.132577

Cited by 6 publications

(3 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Polyaniline has piqued the interest of researchers as an attractive conducting polymer with excellent surface area, substantial stability, high adsorption capacity, nontoxicity, affordable cost, and great environmental advantages. − The surface of the PANI has high adsorption affinities toward the soluble dye molecules, involving different mechanisms such as pi–pi interaction, electrostatic interaction, and H-bonding. , Additionally, the polymeric structure of PANI contains numerous amine and imine functional groups with a single pair of electrons that also induce its adsorption capacity. , Therefore, the coating of the PANI framework on the surfaces of the other materials in the literature resulted in extremely significant structures that exhibited excellent effectiveness in the reduction of common contaminants from wastewaters. ,, This includes its integration with magnetite, cuprous oxide, CNTs, graphite, fibers, graphene, and zeolite. − However, most of the structures are of no sufficient natural availability and still have high costs, low affinities for organic compounds, and complicated synthesis procedures as compared to structure of coal.…”

Section: Introductionmentioning

confidence: 99%

Advanced Equilibrium Studies for the Synergetic Impact of Polyaniline on the Adsorption of Rhodamine B Dye by Polyaniline/Coal Composite

Adel Sayed,

Mohamed,

Ahmed

et al. 2023

ACS Omega

View full text Add to dashboard Cite

The synergetic improvement effect of the polyaniline (PANI) hybridization process on the adsorption of rhodamine B dye (RB) by PANI/coal hybrid material (PANI/C) has been evaluated using both traditional equilibrium modeling and advanced isotherm investigations. The composite was prepared by polymerizing polyaniline in the presence of coal fractions with a surface area of 27.7 m 2 /g. The PANI/C hybrid has an improved capacity to adsorb RB dye (423.5 mg/g) in comparison to coal particles (254.3 mg/g). The maintained increase in the elimination properties of PANI/C has been illustrated using the steric characteristics of active site density (Nm) as well as the total number of adsorbed RB on a single active site (n). However, the incorporation of PANI did not yield any substantial impact on the existing active sites’ quantity, but the hybridization processes greatly influenced the selectivity and affinity of each active site, in addition to the aggregation characteristics of the dye as it interacts with the composite’s surface. Whereas raw coal can only adsorb three molecules of RB, each active site throughout the PANI/C surface can adsorb approximately eight RB molecules. This is also evidence of RB dye adsorption in a vertical arrangement, which involves multimolecular processes. The Gaussian energy (4.01–5.59 kJ/mol) and adsorption energy (−4.34–4.68 kJ/mol) revealed the controllable impact of physical mechanisms. These mechanisms may include van der Waals forces, dipole–dipole interactions, and hydrogen bonds (<30 kJ/mol). The thermodynamic functions, such as enthalpy, internal energy, and entropy, that have been assessed provide evidence supporting the exothermic and spontaneous nature of the RB uptake processes by PANI/C.

show abstract

Section: Introductionmentioning

confidence: 99%

Advanced Equilibrium Studies for the Synergetic Impact of Polyaniline on the Adsorption of Rhodamine B Dye by Polyaniline/Coal Composite

Adel Sayed,

Mohamed,

Ahmed

et al. 2023

ACS Omega

View full text Add to dashboard Cite

show abstract

“…Among the commonly used polymers that exhibit attractive adsorption properties, polyaniline polymer was studied as an effective adsorbent, either as a single phase or as an integrated component in organic/organic or inorganic/organic composites. Technically, it is characterized by its conductive properties, low preparation cost, high surface area, non-toxic properties, significant thermal stability, and high adsorption capacity [45][46][47]. It was expected that the functionalization of synthetic zeolite-A with polyaniline chains would result in an innovative hybrid structure with enhanced adsorption capacity and numerous active adsorption sites for chemical groups to be applied in a more effective decontamination of organic dyes as compared to the synthetic zeolite as a single component.…”

Section: Introductionmentioning

confidence: 99%

Steric and Energetic Studies on the Synergetic Enhancement Effect of Integrated Polyaniline on the Adsorption Properties of Toxic Basic and Acidic Dyes by Polyaniline/Zeolite-A Composite

Zaidalkilani,

Farhan,

Sayed

et al. 2023

Molecules

View full text Add to dashboard Cite

The synergetic enhancement effect of the polyaniline (PANI) integration process on the adsorption properties of the PANI/zeolite-A composite (PANI/ZA) as an adsorbent for malachite green and Congo red synthetic dyes was evaluated based on classic equilibrium modelling in addition to the steric and energetic parameters of advanced isotherm studies. The PANI/ZA composite displays enhanced adsorption capacities for both methylene blue (270.9 mg/g) and Congo red (235.5 mg/g) as compared to ZA particles (methylene blue (179.6 mg/g) and Congo red (140.3 mg/g)). The reported enhancement was illustrated based on the steric parameters of active site density (Nm) and the number of adsorbed dyes per active site (n). The integration of PANI strongly induced the quantities of the existing active sites that have enhanced affinities towards both methylene blue (109.2 mg/g) and Congo red (92.9 mg/g) as compared to the present sites on the surface of ZA. Every site on the surface of PANI/ZA can adsorb about four methylene blue molecules and five Congo red molecules, signifying the vertical orientation of their adsorbed ions and their uptake by multi-molecular mechanisms. The energetic investigation of the methylene blue (−10.26 to −16.8 kJ/mol) and Congo red (−9.38 to −16.49 kJ/mol) adsorption reactions by PANI/ZA suggested the operation of physical mechanisms during their uptake by PANI/ZA. These mechanisms might involve van der Waals forces, dipole bonding forces, and hydrogen bonding (<30 kJ/mol). The evaluated thermodynamic functions, including enthalpy, internal energy, and entropy, validate the exothermic and spontaneous behaviours of the methylene blue and Congo red uptake processes by PANI/ZA.

show abstract

“…Normally, humidity−sensing materials are hydrophilic, porous, and stable [ 15 ]. Until now, humidity sensors based on different types of sensing materials such as metal oxides [ 12 ], polymers [ 16 , 17 , 18 , 19 , 20 ], and carbon materials [ 21 , 22 ] have been reported. Metal−organic frameworks (MOFs), types of compounds famous for their characteristics of porosity, adjustable structure, and good chemical stability [ 23 , 24 , 25 ], have been widely applied in the fields of gas separation and storage [ 26 , 27 ], catalysis [ 28 , 29 ], ion batteries [ 30 , 31 ], etc.…”

Section: Introductionmentioning

confidence: 99%

Humidity Sensors Based on Metal–Organic Frameworks

Teng

Zhang

2022

Nanomaterials

View full text Add to dashboard Cite

Humidity sensors are important in industrial fields and human activities. Metal−organic frameworks (MOFs) and their derivatives are a class of promising humidity−sensing materials with the characteristics of a large specific surface area, high porosity, modifiable frameworks, and high stability. The drawbacks of MOFs, such as poor film formation, low electrical conductivity, and limited hydrophilicity, have been gradually overcome with the development of material science. Currently, it is moving towards a critical development stage of MOF−based humidity sensors from usability to ease of use, of which great challenges remain unsolved. In order to better understand the related challenges and point out the direction for the future development of MOF−based humidity sensors, we reviewed the development of such sensors based on related published work, focusing on six primary types (impedance, capacitive, resistive, fluorescent, quartz crystal microbalance (QCM), and others) and analyzed the sensing mechanism, material design, and sensing performance involved, and presented our thoughts on the possible future research directions.

show abstract

Geometric design optimization of polyaniline/graphite nanocomposite based flexible humidity sensor for contactless sensing and breath monitoring

Cited by 6 publications

References 9 publications

Advanced Equilibrium Studies for the Synergetic Impact of Polyaniline on the Adsorption of Rhodamine B Dye by Polyaniline/Coal Composite

Advanced Equilibrium Studies for the Synergetic Impact of Polyaniline on the Adsorption of Rhodamine B Dye by Polyaniline/Coal Composite

Steric and Energetic Studies on the Synergetic Enhancement Effect of Integrated Polyaniline on the Adsorption Properties of Toxic Basic and Acidic Dyes by Polyaniline/Zeolite-A Composite

Humidity Sensors Based on Metal–Organic Frameworks

Contact Info

Product

Resources

About