The CNT-ZnO nanocomposites were synthesized by addition of commercially available MWCNT during growth of ZnO nanoparticles employing a wet chemical route. These nanocomposites were then spin coated and characterized using X-ray diffraction, scanning electron microscopy, current-voltage characteristics and O2 (5-20%) / NO2 (2-20 ppm) gas sensing at 250°C operating temperature in N2 atmosphere (0.4±0.03 mbar). The addition of CNT in ZnO is found to increase the sensitivity for both O2 and NO2 gas sensing. The 0.1 wt % CNT addition in ZnO is observed to appreciably enhance the NO2 gas sensitivity while 1.0 wt % CNT addition in ZnO showed highest sensitivity for O2 gas detection.
Sol–gel synthesis of pure and Zn-doped SnO2 is demonstrated with variable concentration of Zn (1.5 wt%, 3 wt% and 4.5 wt%) for their potential oxygen sensing applications. X-ray diffraction measurements confirmed the tetragonal rutile type crystal structure of SnO2 nanoparticles having particle sizes as 14 ± 1 nm, 12 ± 1 nm, 10 ± 1 nm and 9 ± 1 nm for the pure, 1.5 wt% Zn, 3 wt% Zn and 4.5 wt% Zn-doped SnO2, respectively. The optical spectroscopy suggested an increase in the band-gap and oxygen deficiency with increase in Zn-doping in SnO2. The I–V measurements yielded a high electrical resistance for 1.5 wt% Zn-doped SnO2 as compared to other specimens. The gas sensing measurements revealed an enhanced sensitivity (37.6%) in 1.5 wt% Zn-doped SnO2 for oxygen gas concentration in the range 5%–20% at 250 °C operating temperature in N2 atmosphere (0.4 ± 0.03 mbar) along with reduced response time as compared to pure, 3 wt% Zn and 4.5 wt% Zn-doped SnO2.
The infusion of nanotechnology into cosmetic formulations marks a transformative shift in beauty science. Although Raymond Reed originally used the word "cosmeceutical," Dr. Albert Kligman popularised the idea in the late 1970s. Cosmetic Nano Wonders are redefining skincare by leveraging nanomaterials to enhance the stability, delivery, and efficacy of active ingredients. The paradigm shift holds promise for overcoming longstanding challenges in traditional cosmetic formulations. This article aims to explore and showcase the revolutionary impact of nanotechnology on the cosmetic industry. Focusing on key nanocarriers, such as liposomes and nanoparticles, our objective is to illuminate how nanotechnology elevates the performance of beauty products, providing advanced solutions for skincare concerns. This revolution promotes sustainability through green synthesis techniques and enables more accurate and effective therapies for a variety of skin issues, including acne and ageing that raises the bar for safety and innovation in the cosmetics business by enhancing product performance and environmental impact. Conducting a thorough literature review, we analyze recent scientific studies and industry reports to unveil the mechanisms and applications of nanotechnology in cosmetics. Special attention is given to the role of nanocarriers in stability enhancement, targeted delivery, and controlled release, unraveling the methods that drive the transformative potential of Cosmetic Nano Wonders. The database sources are Scopus, PubMed, Google Scholar, and Google Patents. The examination of recent research underscores the tangible benefits of nanotechnology in cosmetics. Cosmetic Nano Wonders demonstrate superior stability, enhanced penetration into skin layers, and controlled release mechanisms, showcasing their potential to revolutionize beauty science and address longstanding challenges in skincare. Cosmetic Nano Wonders represent a groundbreaking shift in beauty science, offering unprecedented possibilities for formulators and consumers. As nanotechnology continues to reshape cosmetic formulations, the future holds the promise of safer, more effective, and personalized skincare solutions, ushering in a new era in beauty science.
The paper discusses an application of the field effected transistor (FET) as a voltage controlled resistance which can be done in under-graduate labs either as a routine experiment or as a project.
Pure and 4.5 wt% Zn- doped SnO 2 nanopowders were synthesized by sol-gel method. These nanopowders were characterized by X- ray diffraction, Scanning electron microscopy, UV-Vis spectroscopy, I-V measurements and R-T measurements. XRD results confirmed the formation of tetragonal rutile type SnO 2 with the average crystallite size of 14 ± 1 nm which decreased to 9 ± 1 nm with 4.5 wt% Zn addition. Increase in band gap is observed from UV-Vis spectroscopy. Electrical characterizations revealed increase in resistivity with Zn addition. Temperature dependent resistance measurement showed that both the pure and the Zn- doped samples are suitable for gas sensing applications. A detailed study of these synthesized nanostructured samples is presented and discussed in the paper.
CNT-ZnO nanocomposite powders were synthesized by addition of carbon nanotubes (CNT) during the growth of ZnO nanoparticles using a wet-chemical method. These CNT-ZnO nanocomposites powder were then spin coated on corning glass substrates to obtain thin films which were characterized using X-ray diffraction, scanning electron microscopy and current voltage characteristics. Hydrogen sensing (50- 1000 ppm) carried out on pure and CNT-ZnO nanocomposites at operating temperature of 250 and 300°C in N 2 atmosphere (0.4±0.03 mbar) revealed higher sensitivity in 2 wt.% CNT-ZnO nanocomposite thin film compared to the pure ZnO thin film.
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation Parul Gupta, Rishi Vyas, B. L. Choudhary, K. V. R. Rao, K. Sachdev, D. S. Patil, S. K. Sharma; A comparative study of the sol-gel synthesized nanostructured SnO2 powders. AIP Conf. Proc. 3 June 2013; 1536 (1): 159–160. https://doi.org/10.1063/1.4810149 Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentAIP Publishing PortfolioAIP Conference Proceedings Search Advanced Search |Citation Search
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