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Honeycomb-shaped and ordered arrays of nanopore AAO template with a uniform pores size was produced utilizing a two-step an anodization process. Highly ordered SnO2 nanorods arrays have been selectively fabricated via a convenient (immerse and filtration) technique and (vacuum and drop) setting using anodic aluminum oxide (AAO) as a hard template....
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... Table 1 presents a comparative analysis of the optical bandgaps of SnO 2 nanoparticles fabricated through various techniques. In these different synthesis methods, such as AAO/Sol-gel, Electrospinning, and Template-assisted deposition, the tetragonal SnO 2 phase emerges as the predominant crystal structures [28][29][30][31][32]. It implies that the weak orthorhombic phase in SnO 2 nanowire is responsible for the 3.3 eV optical bandgap energy when compared to other works. ...
A facile AAO (anodic aluminum oxide) template-assisted vacuum die-casting technique was used to create Sn nanowires and convert them into SnO2 without degrading the wires nanostructure. As a function of time and temperature, the controlled oxidation on the Sn nanowires of two different spatial configurations (100 and 250 nm in diameter) revealed distinct oxidation mechanisms. The 250-SnO2 nanowires exhibits a peculiar crumb-like structure formation over the surface due to the higher level of Sn atom dislocation. Conversely, the sub-100 nm SnO2 nanowires shows a highly crystalline, homogenous, and defect-free surfaces. The optical properties of the sub-100 nm SnO2 nanowires were characterized using UV–Vis spectroscopy. The heat-treated tin oxides nanowires samples at temperatures of 300, 500, and 700 °C for 7 h exhibited optical energy bandgaps of 1.8, 2.6, and 3.3 eV, respectively. The observed variation in bandgap is attributed to the unique phase compositions achieved in each of the heat-treated samples. Moreover, the obtained results showed exceptional structural integrity and optical properties that are inherently interconnected with the diverse phases achieved under precise heat treatment conditions.
... This is reflected in a relatively higher green emission intensity in comparison to the of UV emission. For pristine SnO 2 nanowires the PL spectrum produced a broad yellow emission peak within 500-600 nm reflects the presence of oxygen vacancies [32]. The oxygen vacancies often produce luminescence centers formed by Sn interstitials or dangling bonds in the SnO 2 nanowires which produce the yellow emission peak in the PL spectra. ...
While there's a perpetual buzz around zinc oxide superstructures for their unique optical features, the versatile material has been constantly utilized to manifest tailored electronic properties through rendition of distinct morphologies. And yet, the unorthodox approach of implementing the hierarchical structures of ZnO for volatile sensing applications has ample scope to accommodate new unconventional morphologies. Likewise, this article presents self-catalytic synthesis of Sn-doped ZnO nanotetrapods on Si (1. 0. 0) substrates through thermal evaporation-condensation method, and their subsequent deployment for volatile sensing. In particular, the sensors were utilized to detect molecules of acetone and ammonia below their permissible exposure limits which returned sensitivities of around 80% and 50% respectively. The influence of Sn concentration on the growth, microstructural and optical properties of the nanoprisms along with its role in augmenting the sensing parameters has been detailed. The features for the nanoprisms include a length of few micrometers along with a diameter ranging from 300 to 500. nm. High resolution microscopic images confirmed the hexagonal crystallography for the nanoprisms, while SAED pattern asserted the single crystalline nature. An estimate of the sensing parameters against dispensed target molecules highlighted the potential for the nanoprisms as an effective volatile sensing material.
In this work, the fabrication conditions of anodic aluminum oxide (AAO) templates with different pore size diameters were achieved using oxalic, tartaric, and phosphoric acidic electrolytes. Silver (Ag) nanostructures (NSs) were embedded in AAO template by simple hydrothermal and photoreduction methods. Moreover, titanium dioxide (TiO2) NSs (nanowires) was deposited into these porous templates by sol-gel method. FESEM results suggested that Ag nanofishstars, nanonecklaces (NNs), and TiO2 nanowires (NWs) like structures were grown in AAO pores with high-order and -aspect ratios. An anti-adhesive method was used to estimate the nano-size effect of the structures for enhancing antibacterial mechanism against Pseudomonas aeruginosa Gram-negative bacterium, and Staphylococcus aureus Gram-positive bacterium. In this study, the inhibition percentages of the Ag NNs/AAO membrane were 86.4, and 77.4%, respectively whereas that of the Ag film on glass substrate were 65, and 53.9%. Moreover, the inhibition percentages of the TiO2 NWs/AAO membrane were 85.9, and 70.1%, on the other hand, the TiO2 film on glass substrate were 60.3, and 45.2%. Results proved that the high porosity of the AAO template improved the contact-killing and release-killing actions of nanoparticles against biofilms.
