Programming nanostructured soft biological surfaces by atomic layer deposition

Abstract. Applying atomic layer deposition (ALD) very thin zinc oxide (ZnO) films were deposited on quartz resonators, and their gas sensing properties were studied using the quartz crystal microbalance (QCM) method. The gas sensing of the ZnO films to NO 2 was tested in the concentration interval between 10 and 5000 ppm. On the basis of registered frequency change of the QCM, for each concentration the sorbed mass was calculated. Further characterization of the films was carried out by various techniques, i.e. by SEM-EDS, XRD, ellipsometry, and FTIR spectroscopy. Although being very thin, the films were gas sensitive to NO2 already at room temperature and could register very well as low concentrations as 100 ppm, while the sorption was fully reversible. Our results for very thin ALD ZnO films show that the described fast, simple 3 and cost-effective technology could be implemented for producing gas sensors working at room temperature and being capable to register in real time low concentrations of NO 2 .

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“…With these advantages, ALD became a powerful tool for many industrial and research applications [17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of ALD deposited ZnO thin films studied for gas sensors

Boyadjiev

Георгиева

Yordanov

et al. 2016

Applied Surface Science

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“…Photocathodes to produce hydrogen through water photoelectrolysis can be prepared by covering silicon nanobelts arrays by thin TiO 2 protection layer using ALD [70]. A very interesting example of self-cleaning photocatalytic surfaces was obtained, when TiO 2 layers were grown on lotus leaves to yield a superhydrophobic and photocatalytic bionanocomposite with tuneable properties [71]. …”

Section: Photocatalytic Thin Films and Nanostructures Prepared By Aldmentioning

confidence: 99%

Technologies for deposition of transition metal oxide thin films: application as functional layers in “Smart windows” and photocatalytic systems

Gesheva

Ivanova

Bodurov

et al. 2016

J. Phys.: Conf. Ser.

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Abstract. "Smart windows" are envisaged for future low-energy, high-efficient architectural buildings, as well as for the car industry. By switching from coloured to fully bleached state, these windows regulate the energy of solar flux entering the interior. Functional layers in these devices are the transition metals oxides. The materials (transitional metal oxides) used in smart windows can be also applied as photoelectrodes in water splitting photocells for hydrogen production or as photocatalytic materials for self-cleaning surfaces, waste water treatment and pollution removal. Solar energy utilization is recently in the main scope of numerous world research laboratories and energy organizations, working on protection against conventional fuel exhaustion. The paper presents results from research on transition metal oxide thin films, fabricated by different methods -atomic layer deposition, atmospheric pressure chemical vapour deposition, physical vapour deposition, and wet chemical methods, suitable for flowthrough production process. The lower price of the chemical deposition processes is especially important when the method is related to large-scale glazing applications. Conclusions are derived about which processes are recently considered as most prospective, related to electrochromic materials and devices manufacturing. Transition metal oxidesTransition metal oxides (TMO) are claimed to be one of the most interesting classes of solids, exhibiting varieties of properties, structures and applications [1]. Their properties are determined by the unique nature of their outer d-electrons. Transition-metal oxides can be insulators, semiconductors, metals, or undergo semiconductor-metal transitions. Transition metal oxides possess unusual and useful electronic, optical and magnetic properties. Many of these properties strongly depend on materials defects like vacancies, dislocations, stacking faults and grain boundaries [2].

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“…Hierarchically organized nano-structured composites can be fabricated via nano-imprint lithography, 112 photo-imprinting 72 and atomic layer deposition. 113 Mimicking the structure of biological materials is another interesting direction for developing composites with biomimetic properties, e.g., electrospun composite nanofibers. Due to their similarity to the extracellular matrix and ease of incorporation of drugs (e.g., chemotherapeutic drugs, 114 antibiotics 115,116 ), growth factors, natural materials, 117 and inorganic nanofillers, 118 electrospun composite nanofibers have been proposed for drug delivery 117,119,120 and tissue engineering applications.…”

Section: Functionalized Compositesmentioning

confidence: 99%