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Solution-Processable Growth and Characterization of Dandelion-like ZnO:B Microflower Structures. CRYSTALS 2021. [DOI: 10.3390/cryst12010011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Intrinsic and dandelion-like microflower nano-rod structures of boron-doped ZnO thin films were synthesized with an ecofriendly and cost-effective chemical bath deposition technique from an aqueous solution of zinc nitrate hexahdyrate [Zn(NO3)2.6H2O] as a precursor solution and boric acid as a doping solution. The boron concentrations were 0.1, 0.3, 0.5, 1.0, 3.0, 5.0, and 7.0 by volume. Scanning electron micrographs showed that doping with boron appears to hinder the vertical alignment of crystallites. Additionally, independent hexagonal nano-rod structures were observed to coalesce together to form dandelion-like structures on the film’s surface. The atomic ratio of the elements was determined via the X-ray photoemission spectrum technique. There were no substantial changes in the vibration structure of the film upon doping in terms of the Raman spectra. The optical band gap of ZnO (3.28 eV) decreased with B doping. The band gap of the ZnO:B film varied between 3.18 and 3.22 eV. The activation energy of the ZnO was calculated as 0.051 eV, whereas that of the ZnO:B film containing 1.0% B was calculated as 0.013 eV at low temperatures (273–348 K), versus 0.072 eV and 0.183 eV at high temperatures (348–523 K), respectively. Consequently, it can be interpreted that the 1% B-doped ZnO, which has the lowest activation energy at both low and high temperatures, may find some application areas such as in sensors for gases and in solar cells.
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Aqeel T, Abdullah HN. Direct one-step synthesis of mesoporous ZnO-silicate matrix using a true liquid crystal method. MAIN GROUP CHEMISTRY 2018. [DOI: 10.3233/mgc-180266] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Affiliation(s)
- Tariq Aqeel
- Department of Science, College of Basic Education, the Public Authority of Applied Education and Training (PAAET) Kuwait, Safat, Kuwait
| | - Haifaa N. Abdullah
- Department of Laboratories – Applied Chemistry, College of Technological Studies, (PAAET) Kuwait
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Xu S, Sun T, Xu Q, Duan C, Dai Y, Wang L, Song Q. Preparation and Antibiofilm Properties of Zinc Oxide/Porous Anodic Alumina Composite Films. NANOSCALE RESEARCH LETTERS 2018; 13:201. [PMID: 29987504 PMCID: PMC6037642 DOI: 10.1186/s11671-018-2568-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/22/2017] [Accepted: 05/03/2018] [Indexed: 06/08/2023]
Abstract
The PAA (porous anodic alumina) films were prepared by two-step anodic oxidation after different times, and then the ZnO/PAA composite films were prepared by sol-gel method on their surface. Meanwhile, the ZnO/PAA composite films were characterized by X-ray diffraction (XRD), thermogravimetric/differential thermal analyzer (TG/DTA), Fourier transform infrared spectrometer (FT-IR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), selected area electron diffraction (SAED), and water contact angle (CA). The antibiofilm properties of ZnO/PAA composite films on Shewanella putrefaciens were measured simultaneously. The results show that the micromorphologies of PAA and ZnO/PAA composite films are affected by second anodization time. ZnO is a hexagonal wurtzite structure, and ZnO particles with a diameter of 10-30 nm attach to the inner or outer surfaces of PAA. After being modified by Si69, the ZnO films translate from hydrophilia to hydrophobicity. The ZnO/PAA film with the optimal antibiofilm properties is prepared on the PAA surface by two-step anodization for 40 min. The adherence of Shewanella putrefaciens is restrained by its super-hydrophobicity, and the growth of biofilm bacteria is inhibited by its abundant ZnO particles.
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Affiliation(s)
- Shuying Xu
- School of Metallurgy, Northeastern University, Shenyang, 110004 China
- College of Chemistry and Chemical Engineering, Bohai University, Jinzhou, 121013 Liaoning China
| | - Tong Sun
- College of Food Science and Project Engineering, Bohai University, Jinzhou, 121013 Liaoning China
| | - Qian Xu
- State Key Laboratory of Advanced Special Steel, School of Materials Science and Engineering, Shanghai University, Shanghai, 200072 China
| | - Changping Duan
- College of Chemistry and Chemical Engineering, Bohai University, Jinzhou, 121013 Liaoning China
- The 404 Company Limited, China Nation Nuclear Corporation, Lanzhou, 730000 China
| | - Yue Dai
- College of Food Science and Project Engineering, Bohai University, Jinzhou, 121013 Liaoning China
- Liaoning Anjoy Food Co., Ltd., Anshan, 114100 Liaoning China
| | - Lili Wang
- Laboratory Management Center, Bohai University, Jinzhou, 121013 Liaoning China
| | - Qiushi Song
- School of Metallurgy, Northeastern University, Shenyang, 110004 China
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Effect of zinc oxide film morphologies on the formation of Shewanella putrefaciens biofilm. Biointerphases 2017; 12:011002. [PMID: 28183187 DOI: 10.1116/1.4976003] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Zinc oxide (ZnO) films were prepared on aluminum substrate by a hydrothermal method to investigate the effect of their surface characteristics, including morphology and hydrophobicity, on the corresponding antibiofilm performance. The surface characteristics of the prepared ZnO films were examined by a comprehensive range of methodologies, suggesting that films of distinctive surface morphologies were successfully formed. Subsequently, their antibiofilm activities, using Shewanella putrefaciens as a model bacterium, were assessed. Surface measurements confirmed that the ZnO films equipped with a nanoscopic needlelike surface feature are more hydrophobic than those possessing densely packed microflakes. The reduced number of live cells and presence of biofilm, confirmed by optical and electron microscopy results, suggest that the former films possess an excellent antibiofilm performance. It is believed that the engineered nanoscopic needle feature might penetrate the cell membrane when they are in contact, allowing the effective substance of ZnO antibacterial ingredients to diffuse into the embedded bacteria. Furthermore, such surface characteristics might perturb the integrity of the cell membrane causing the intracellular substance is leaked from the cells. As such, the combinatorial effects of nanoscopic feature resulted in an inhibited growth of S. putrefaciens biofilm on ZnO film.
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Bhunia R, Ghosh B, Ghosh D, Hussain S, Bhar R, Pal AK. Free-standing and flexible nano-ZnO/PVDF composite thin films: impedance spectroscopic studies. POLYM ADVAN TECHNOL 2015. [DOI: 10.1002/pat.3551] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Ritamay Bhunia
- Department of Instrumentation Science, USIC Building; Jadavpur University; Calcutta 700 032 India
| | - Barun Ghosh
- Department of Instrumentation Science, USIC Building; Jadavpur University; Calcutta 700 032 India
| | - Dibyendu Ghosh
- Department of Instrumentation Science, USIC Building; Jadavpur University; Calcutta 700 032 India
| | | | - Radhaballabh Bhar
- Department of Instrumentation Science, USIC Building; Jadavpur University; Calcutta 700 032 India
| | - Arun Kumar Pal
- Department of Instrumentation Science, USIC Building; Jadavpur University; Calcutta 700 032 India
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Anitha S, Brabu B, John Thiruvadigal D, Gopalakrishnan C, Natarajan TS. Optical, bactericidal and water repellent properties of electrospun nano-composite membranes of cellulose acetate and ZnO. Carbohydr Polym 2013; 97:856-63. [PMID: 24066357 DOI: 10.1016/j.carbpol.2013.05.003] [Citation(s) in RCA: 64] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
In this report, ZnO nanoparticles embedded cellulose acetate (CA) fibrous membrane with multifunctional properties have been prepared through electrospinning method. The morphology of the electrospun composite membrane was analyzed by scanning electron microscope (SEM). It was found that the polymer concentration in the solution has a significant effect on the morphology of the fibers. The optical property of the sample was tested using photo luminescence (PL) spectra. There is no significant change in the emission features of cellulose acetate with the addition of ZnO. The anti-bacterial property of the sample was studied using disk diffusion method. The wettability of the pure and composite fibrous membrane was also studied by measuring the contact angle of water on the membrane. It was observed that the embedded ZnO in the CA was responsible for the hydrophobic nature of the surface.
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Affiliation(s)
- S Anitha
- Centre for Materials Sciences and Nanodevices, Department of Physics, SRM University, Chennai 603203, India
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Anitha S, Brabu B, Thiruvadigal DJ, Gopalakrishnan C, Natarajan T. Optical, bactericidal and water repellent properties of electrospun nano-composite membranes of cellulose acetate and ZnO. Carbohydr Polym 2012. [DOI: 10.1016/j.carbpol.2011.08.030] [Citation(s) in RCA: 131] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Bekermann D, Ludwig A, Toader T, Maccato C, Barreca D, Gasparotto A, Bock C, Wieck AD, Kunze U, Tondello E, Fischer RA, Devi A. MOCVD of ZnO Films from Bis(Ketoiminato)Zn(II) Precursors: Structure, Morphology and Optical Properties. ACTA ACUST UNITED AC 2011. [DOI: 10.1002/cvde.201006898] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Chuaybamroong P, Thunyasirinon C, Supothina S, Sribenjalux P, Wu CY. Performance of photocatalytic lamps on reduction of culturable airborne microorganism concentration. CHEMOSPHERE 2011; 83:730-735. [PMID: 21339001 DOI: 10.1016/j.chemosphere.2011.01.054] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/04/2010] [Revised: 01/23/2011] [Accepted: 01/24/2011] [Indexed: 05/30/2023]
Abstract
Reduction of viable airborne Staphylococcus epidermidis and Aspergillus niger spore concentrations using two types of photocatalytic fluorescent lamps under controlled environmental conditions (25 vs. 35°C and 55 vs. 75% relative humidity) were investigated. Visible white-light and UVA black light were in-house spray-coated with TiO(2) and then compared with a commercially coated visible white-light for microbial concentration reduction. The white-light photocatalytic lamps reduced the concentration of culturable S. epidermidis up to 92% independent of temperature or humidity change, while the black light photocatalytic lamps completely inactivated the culturable bacteria at 25°C, 55% relative humidity. Humidity seemed to alleviate UVA damage since better bacteria survival was found. For A. niger spores, rising humidity or temperature could lower their concentration or drop their culturabilities so that a difference between the natural decay and photocatalytic disinfection could not be distinguished. Reductions of total bacteria and total fungi concentrations using these lamps were also examined under uncontrolled environmental conditions in an office and a waste-storage room. It was found that photocatalytic lamps could reduce total culturable bacteria concentration from 9 to 97% and total culturable fungi concentration from 3 to 95% within irradiation time of 30-480 min, respectively. Insignificant difference in concentration reduction among these photocatalytic lamps was pronounced.
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Affiliation(s)
- Paradee Chuaybamroong
- Department of Environmental Science, Faculty of Science and Technology, Thammasat University, Thailand.
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Amin G, Asif MH, Zainelabdin A, Zaman S, Nur O, Willander M. Influence of pH, Precursor Concentration, Growth Time, and Temperature on the Morphology of ZnO Nanostructures Grown by the Hydrothermal Method. JOURNAL OF NANOMATERIALS 2011; 2011:1-9. [PMID: 0 DOI: 10.1155/2011/269692] [Citation(s) in RCA: 69] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
We investigated the influence of the pH value, precursor concentration (C), growth time and temperature on the morphology of zinc oxide (ZnO) nanostructures. The pH of the starting solution was varied from 1.8 to 12.5. It was found that the final pH reaches an inherent value of 6.6 independently of the initial pH solution. Various ZnO structures of nanotetrapod-like, flower-like, and urchin-like morphology were obtained at alkaline pH (8 to 12.5) whereas for pH solution lower than 8 rod-like nanostructures occurred. Moreover, we observed the erosion of the nanorods for a pH value less than 4.6. By changing the concentrations the density and size were also varied. On going from a high (C>400 mM) to lower (C<25 mM)C, the resulted ZnO nanostructures change from a film to nanorods (NRs) and finally nanowires (NWs). It was also found that the length and diameter of ZnO NRs follow a linear relation with time up to 10 hours, above which no further increase was observed. Finally the effect of growth temperature was seen as an influence on the aspect ratio.
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Affiliation(s)
- G. Amin
- Department of Science and Technology, Linköping University, Norrköping Campus, 60174 Norrköping, Sweden
| | - M. H. Asif
- Department of Science and Technology, Linköping University, Norrköping Campus, 60174 Norrköping, Sweden
| | - A. Zainelabdin
- Department of Science and Technology, Linköping University, Norrköping Campus, 60174 Norrköping, Sweden
| | - S. Zaman
- Department of Science and Technology, Linköping University, Norrköping Campus, 60174 Norrköping, Sweden
| | - O. Nur
- Department of Science and Technology, Linköping University, Norrköping Campus, 60174 Norrköping, Sweden
| | - M. Willander
- Department of Science and Technology, Linköping University, Norrköping Campus, 60174 Norrköping, Sweden
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Dunlop P, Sheeran C, Byrne J, McMahon M, Boyle M, McGuigan K. Inactivation of clinically relevant pathogens by photocatalytic coatings. J Photochem Photobiol A Chem 2010. [DOI: 10.1016/j.jphotochem.2010.07.004] [Citation(s) in RCA: 72] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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