Aero-gel based CeO<sub>2</sub> nanoparticles: synthesis, structural properties and detailed humidity sensing response

Poonia, Ekta; Mishra, Prashant Kumar; Kiran, Vijay; Sangwan, Jasbir; Kumar, Rakesh; Kumar, Pramod; Malik, Ritu; Tomer, Vijay K.; Ahuja, Rajeev; Mishra, Yogendra Kumar

doi:10.1039/c9tc01081e

Cited by 63 publications

(28 citation statements)

References 52 publications

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“…To date, various techniques have been used for fabricating polymeric scaffolds with different structures and morphologies including electrospinning, freeze-drying, gas-foaming, solvent casting particulate-leaching, and streo-lithography [19][20][21][22][23][24]. The physico-chemical properties of polymers along with their surface characteristics define the choice of method for scaffold preparation [25].…”

Section: Introductionmentioning

confidence: 99%

Status and future scope of plant-based green hydrogels in biomedical engineering

Mohammadinejad

Maleki

Larrañeta

et al. 2019

Applied Materials Today

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169

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Hydrogels are the most iconic class of soft materials and since their first report in the literature has attracted the attention of uncountable researchers. Over the past two decades, hydrogels become smart and sophisticated materials with plenty of applications possibilities. The biomedical research area has demonstrated a particular interest in hydrogels since they can be engineered from different polymers and due to their tunable properties. Moreover, hydrogels engineered from polymers extracted from biorenewable sources have been popularized in biomedical usages, as they are low-toxic, eco-friendly, biocompatible, easily accessible, and inexpensive at the same time. However, the multifaceted challenge is to find an ideal plant green hydrogel in the tissue engineering that can mimic critical properties of human tissues in terms of structure, function, and performance. In addition, these natural polymers are also idealized to be conveniently functionalized so that their chemical and physical behaviour can be manipulated for drug delivery and stem cell-guided tissue regeneration. Here, the most recent advances in the synthesis, fabrication and application of plant green hydrogels in biomedical engineering are reviewed. It covers essential and updated information about plant as green sources of biopolymers to be used in hydrogel synthesis, general aspects of hydrogels and plant green hydrogels and a substantive discussion regarding the use of such hydrogels in the biomedical engineering area. Furthermore, this review addresses and detail the present status of the field and, also, answer several important questions about the potential use of plant green hydrogels in advanced biomedical applications including therapeutic, tissue engineering, wound dressing, diagnostic, etc.

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Section: Introductionmentioning

confidence: 99%

Status and future scope of plant-based green hydrogels in biomedical engineering

Mohammadinejad

Maleki

Larrañeta

et al. 2019

Applied Materials Today

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169

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“…Besides the traditional use of CeO 2 in catalytic and photocatalytic processes, CeO 2 is envisaged to be implemented in a wide range of technical applications including material polishing, ultraviolet shielding, ceramics composites and sensors as it can easily absorb light in both visible and UV ranges [ 5 ]. Development of such applications requires the use of a convenient matrix for efficient incorporation of the nanoparticles, to enhance the performance, avoid the cluster growth and aggregation and improve the handling and recovery of the nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Cellulose Acetate Incorporating Organically Functionalized CeO2 NPs: Efficient Materials for UV Filtering Applications

et al. 2020

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One of the major issues faced when constructing various materials incorporating inorganic nanoparticles (NPs) is aggregation leading to loss of their final activity. In our work, cellulose acetate (CA) has been used to serve as matrix for the synthesis of UV-shielding and transparent films containing various amounts (1–5 wt.%) of cerium oxide (CeO2) NPs. In order to attain an improved dispersion and a better connectivity between NPs and the cellulose matrix, the surface of CeO2 NPs have been previously functionalized by the reaction with 3-aminopropyl(diethoxy)methylsilane (APDMS). The uniform dispersion of the NPs in the homogeneous thin films has been evidenced by using Transmission Electron Microscopy (TEM) and Fourier Transformation Infrared Spectroscopy (FTIR) characterization. The investigation of the optical properties for the hybrid films through UV-Vis spectroscopy revealed that the presence of CeO2 NPs in the CA matrix determined the appearance of strong UV absorption bands in the region 312–317 nm, which supports their use as efficient UV absorbers. This study has shown that UV shielding ability of the nanocomposites can be easily tuned by adjusting the numberof inorganic NPs in the CA template.

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“…Their effects are primarily band bending and the changes in the electronic affinity of the semiconductor prior to the adsorption. [ 26 ] Researchers have investigated sensing mechanisms, including oxygen adsorption models, [ 27 ] chemical adsorption/desorption models, [ 28 ] physical adsorption/desorption models, [ 29 ] bulk resistance control mechanism, [ 30 ] and gas diffusion control mechanism. [ 31 ] The most mainstream gas sensing mechanism can be based on the oxygen adsorption models, which are suitable for almost all MOS gas sensing materials.…”

Section: Resultsmentioning

confidence: 99%

Complementary Metal–Oxide–Semiconductor Compatible 2D Layered Film‐Based Gas Sensors by Floating‐Gate Coupling Effect

Tan

Hsu

Shen

et al. 2021

Adv Funct Materials

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A 2D SnSe 2 layered film-based gas detector incorporating a floating-gate device coupled with metal interconnect wiring structures is proposed and demonstrated for the first time. Linear amplification can be readily implemented using a coupling ratio design, which refers to the capacitance ratio between the gate and device in the sense amplifier circuits. A sensitivity of 102 mV ppm −1 can be obtained using the 2D SnSe 2 layered film with a thickness of 10 nm. The 2D SnSe 2 layered film-based complementary metal-oxidesemiconductor (CMOS) gas detector features highly sensitive, wide, and adjustable dynamic ranges with a real-time response of the sub-ppm detection limit on NO 2 gas. In addition, the synthesis process of the SnSe 2 layered film can occur at a low temperature and be operated at room temperature. Furthermore, 3 × 3 gas detector arrays with peripheral circuits demonstrate the functionality of multiple gas detection simultaneously and 16 × 16 arrays with a decoder and other peripheral circuits are constructed and simulated, providing the spatial distribution of the gas concentration in a specific region. The performance of the proposed detector is comparable to that of the other state-of-the-art gas sensors.

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Aero-gel based CeO₂ nanoparticles: synthesis, structural properties and detailed humidity sensing response

Abstract: Mechanism of %RH sensing using aero-gel based CeO2 nanoparticles.

Cited by 63 publications

References 52 publications

Status and future scope of plant-based green hydrogels in biomedical engineering

Status and future scope of plant-based green hydrogels in biomedical engineering

Cellulose Acetate Incorporating Organically Functionalized CeO2 NPs: Efficient Materials for UV Filtering Applications

Complementary Metal–Oxide–Semiconductor Compatible 2D Layered Film‐Based Gas Sensors by Floating‐Gate Coupling Effect

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Aero-gel based CeO2 nanoparticles: synthesis, structural properties and detailed humidity sensing response

Abstract: Mechanism of %RH sensing using aero-gel based CeO2 nanoparticles.

Cited by 63 publications

References 52 publications

Status and future scope of plant-based green hydrogels in biomedical engineering

Status and future scope of plant-based green hydrogels in biomedical engineering

Cellulose Acetate Incorporating Organically Functionalized CeO2 NPs: Efficient Materials for UV Filtering Applications

Complementary Metal–Oxide–Semiconductor Compatible 2D Layered Film‐Based Gas Sensors by Floating‐Gate Coupling Effect

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Aero-gel based CeO₂ nanoparticles: synthesis, structural properties and detailed humidity sensing response