Zinc oxide nanostructures for applications as ethanol sensors and dye-sensitized solar cells

Choopun, Supab; Tubtimtae, Auttasit; Santhaveesuk, Theerapong; Nilphai, Sanpet; Wongrat, Ekasiddh; Hongsith, Niyom

doi:10.1016/j.apsusc.2009.05.139

Cited by 104 publications

(40 citation statements)

References 18 publications

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“…Several studies have indicated that the performance of gas sensor is primarily determined by the species and the amount of chemisorbed oxygen density on the surface area of semiconductor oxide nanostructures [16,25,26]. In general, when exposed to air, oxygen molecules on the P 0 ZO sensor surface trap electrons from the conduction band to generate a depletion layer as shown by Fig.…”

Section: Sensing Performance and Mechanismmentioning

confidence: 98%

Optimization of Pd content in ZnO microstructures for high-performance gas detection

Gao

Sang

et al. 2014

J Mater Sci

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Pure ZnO and Pd/ZnO microstructures were prepared by hydrothermal method. The crystalline structures, morphology, and composition of synthesized hexagon hammer Pd/ZnO microstructures were analyzed by X-ray diffraction (XRD), scanning electron microscope (SEM), and energy dispersive X-ray spectroscopy (EDS). They were then studied for gas detection in order to achieve the optimal concentration of Pd in ZnO. Our results show that overall the Pd/ZnO microstructures have a better performance for ethanol detection comparing to the one without Pd, including a better sensitivity, a decreased operating temperature, and a shortened response/recovery time. At the optimal Pd concentration of 0.25 wt%, we observed a sensitivity enhancement of 3.5 times larger than that of ZnO without doping and a response and recovery time of 10 and 7 s, respectively. Moreover, the Pd/ZnO sensors could show a high selectivity and an excellent chemical stability, thereby providing a way to improve the gas sensing performances.

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Section: Sensing Performance and Mechanismmentioning

confidence: 98%

Optimization of Pd content in ZnO microstructures for high-performance gas detection

Gao

Sang

et al. 2014

J Mater Sci

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“…Recent studies have shown that NP of some materials, including metal oxides, can induce cell death in eukaryotic cells (Everts et al 2006;Nel et al 2006;Gupta and Gupta 2005;Magrez et al 2006) and growth inhibition in prokaryotic cells (Brayner et al 2006;Thill et al 2006) due to its cytotoxicity. ZnO was among the most widely used NPs since they have applications in a large variety of sectors ranging from personal care products to coatings and catalysts in environmental remediation (Choopun et al 2009;Kamat and Meisel 2003;Wang 2004). Manzo et al (2010) have reported that ZnO nanoparticles exert toxic and genotoxic effects upon terrestrial organisms like plants (Lepidium sativum, Vicia faba), crustaceans (Heterocyipris incongruens), and insects (Folsomia candida).…”

Section: Introductionmentioning

confidence: 99%

Acaricidal, pediculocidal and larvicidal activity of synthesized ZnO nanoparticles using wet chemical route against blood feeding parasites

Kirthi¹,

Rahuman²,

Rajakumar³

et al. 2011

Parasitol Res

109

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The present study was based on assessments of the anti-parasitic activities to determine the efficacies of synthesized zinc oxide nanoparticles (ZnO NPs) prepared by wet chemical method using zinc nitrate and sodium hydroxide as precursors and soluble starch as stabilizing agent against the larvae of cattle tick Rhipicephalus (Boophilus) microplus, Canestrini (Acari: Ixodidae); head louse Pediculus humanus capitis, De Geer (Phthiraptera: Pediculidae); larvae of malaria vector, Anopheles subpictus, Grassi; and filariasis vector, Culex quinquefasciatus, Say (Diptera: Culicidae). R. microplus larvae were exposed to filter paper envelopes impregnated with different ZnO NP concentrations. Direct contact method was conducted to determine the potential of pediculocidal activity. Parasite larvae were exposed to varying concentrations of synthesized ZnO NPs for 24 h. The results suggested that the mortality effects of synthesized ZnO NPs were 43% at 1 h, 64% at 3 h, 78% at 6 h, and 100% after 12 h against R. microplus activity. In pediculocidal activity, the results showed that the optimal times for measuring mortality effects of synthesized ZnO NPs were 38% at 10 min, 71% at 30 min, 83% at 1 h, and 100% after 6 h against P. humanus capitis. One hundred percent lice mortality was observed at 10 mg/L treated for 6 h. The mortality was confirmed after 24 h of observation period. The larval mortality effects of synthesized ZnO NPs were 37%, 72%, 100% and 43%, 78% and 100% at 6, 12, and 24 h against A. subpictus and C. quinquefasciatus, respectively. It is apparent that the small size and corresponding large specific surface area of small nanometer-scale ZnO particles impose several effects that govern its parasitic action, which are size dependent. ZnO NPs were synthesized by wet chemical process, and it was characterized with the UV showing peak at 361 nm. X-ray diffraction (XRD) spectra clearly shows that the diffraction peaks in the pattern indexed as the zinc oxide with lattice constants a = 3.249 and c = 5.206 Å. The FTIR spectrum showed the range of 400-4,000 cm(-1). The band at 899.56 cm(-1); 1,151.87 cm(-1); 1,396 cm(-1); and these bands showed the complete composition of ZnO NPs. SEM micrograph showed 60-120-nm size and aggregates of spherical shape nanoparticles. EDX showed the complete chemical composition of the synthesized nanoparticles of zinc oxide. The maximum efficacy was observed in zinc oxide against the R. microplus, P. humanus capitis, and the larvae of A. subpictus, C. quinquefasciatus with LC(50) values of 29.14, 11.80, 11.14, and 12.39 mg/L; r (2) = 0.805, 0.876, 0.894, and 0.904, respectively. The synthesized ZnO NPs showed the LC(50) and r (2) values against the R. microplus (13.41 mg/L; 0.982), P. humanus capitis (11.80 mg/L; 0.966), and the larvae of A. subpictus (3.19; 0.945 mg/L), against C. quinquefasciatus (4.87 mg/L; 0.970), respectively. The control (distilled water) showed nil mortality in the concurrent assay. This is the first report on anti-parasitic activity of the synthesized ZnO NPs.

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“…In this frame, ZnO are among the most widely used NPs since they have applications in a large variety of sectors ranging from personal care products to coatings and catalysts in environmental remediation (Choopun et al 2009;Kamat and Meisel 2003;Wang 2004).…”

Section: Introductionmentioning

confidence: 99%

Investigation of ZnO nanoparticles’ ecotoxicological effects towards different soil organisms

Manzo

Rocco

Carotenuto

et al. 2010

Environ Sci Pollut Res

125

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Zinc oxide nanostructures for applications as ethanol sensors and dye-sensitized solar cells

Cited by 104 publications

References 18 publications

Optimization of Pd content in ZnO microstructures for high-performance gas detection

Optimization of Pd content in ZnO microstructures for high-performance gas detection

Acaricidal, pediculocidal and larvicidal activity of synthesized ZnO nanoparticles using wet chemical route against blood feeding parasites

Investigation of ZnO nanoparticles’ ecotoxicological effects towards different soil organisms

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