Three-dimensional flexible ceramics based on interconnected network of highly porous pure and metal alloyed ZnO tetrapods

Gröttrup, Jorit; Paulowicz, Ingo; Schuchardt, Arnim; Kaidas, Victor; Kaps, Sören; Lupan, Oleg; Adelung, Rainer; Mishra, Yogendra Kumar

doi:10.1016/j.ceramint.2016.02.099

Cited by 66 publications

(61 citation statements)

References 58 publications

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“…The MexOy and ZnxMe1-xOy doped and alloyed ZnO-T hybrid networks with high porosity were obtained by mixing in different weight ratios ZnO-T (produced by C-FTS approach) with Me (Me = Fe, Cu, Al) and followed by subsequent thermal annealing in air in a furnace at 1150 C for 5 h. 4 The produced samples were fully characterized by X-ray diffraction (XRD), micro-Raman, diffuse reflectance, photoluminescence (PL) and PL excitation (PLE) by using the experimental set-ups described in Supporting Information Text S1.…”

Section: Methodsmentioning

confidence: 99%

“…[3][4][12][13][14] As above mentioned, before the integration of ZnO-T-MexOy and ZnO-TZnxMe1-xOy (Me = Fe, Cu, Al) hybrid networks into the sensor structure, the as-produced samples were subjected to thermal annealing in an electrical furnace at 1150 ºC for 5 h in air.…”

Section: Methodsmentioning

confidence: 99%

“…By mixing the metal microparticles powder with ZnO-T using the C-FTS approach, different 3-D interconnected ZnO-T-MexOy and ZnO-T-ZnxMe1-xOy hybrid networks were successfully obtained. 4 Morphological, structural, electrical and mechanical strength properties were reported in a previous article. 4 In present work, we report for the first time on gas sensing performances of the ZnO-TFe2O3, ZnO-T-CuO and ZnO-T-ZnAl2O4 highly porous interconnected 3-D hybrid networks.…”

Section: 3-mentioning

confidence: 99%

“…The characterization of pristine ZnO-T networks was performed in detail in previous works [3][4] and by using the experimental set-ups described in Supporting Information Text S1. Figure S1).…”

Section: Morphology Of Zno-t-mexoy and Zno-t-znxme1-xoy 3-d Hybrid Nementioning

confidence: 99%

“…[2][3] However, the rapid progress in nanotechnologies includes the continuous search of novel materials with new and unique functionalities, which is in focus of many research groups around the world. [1][2][3][4][5][6] In this context, fabrication of three-dimensional (3-D) networks of interconnected ZnO tetrapods (ZnO-T) has been a very important step for progress in engineering, science and nanotechnology. 1,[3][4][6][7][8] Recently the research group of Rainer Adelung has demonstrated a fast and simple synthesis of highly porous interconnected ZnO-T networks by a crucible flame transport synthesis (C-FTS) approach and burner flame transport synthesis (B-FTS).…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Hybridization of Zinc Oxide Tetrapods for Selective Gas Sensing Applications

Lupan

Postica

Gröttrup

et al. 2017

ACS Appl. Mater. Interfaces

136

113

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In this work, the exceptionally improved sensing capability of highly porous 3-D hybrid ceramic networks with respect to reducing gases is demonstrated for the first time. The 3-D hybrid ceramic networks are based on metal oxides Me= Fe, Cu, Al) doped and alloyed zinc oxide tetrapods (ZnO-T) forming numerous heterojunctions. A change in morphology of the samples and formation of different complex microstructures is achieved by mixing the metallic (Fe, Cu, Al) microparticles with ZnO tetrapods grown by flame transport synthesis (FTS) approach with different weight ratios (ZnO:Me, e.g., 20:1) and followed by subsequent thermal annealing them in air. The gas sensing studies reveal the possibility to control and change/tune the selectivity of the materials, depending on the elemental content ratio and the type of the added metal oxide in 3-D ZnO-T hybrid networks.While pristine ZnO-T networks showed a good response to H2 gas, a change/tune in selectivity to ethanol vapour with a decrease in optimal operating temperature was observed in the networks hybridized with Fe-oxide and Cu-oxide. In case of hybridization with ZnAl2O4 an improvement of H2 gas response (to ≈ 7.5) was reached at lower doping concentrations (20:1), whereas the increasing in concentration of ZnAl2O4 (10:1), the selectivity changes to methane CH4 gas (response ≈ 28). Selectivity tuning to different gases is attributed to the catalytic properties of the metal oxides after hybridization, while the sensitivity improvement is mainly associated with additional modulation of resistance by the built-in potential barriers between n-n and n-p heterojunctions, during adsorption and desorption of gaseous species. Density functional theory based calculations provided the mechanistic insights into the interactions between different hybrid networks and gas molecules supporting the experimentally observed results. The studied materials and sensor structures would provide particular advantages in the field of fundamental research, industrial and ecological applications.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: 3-mentioning

confidence: 99%

Section: Morphology Of Zno-t-mexoy and Zno-t-znxme1-xoy 3-d Hybrid Nementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Hybridization of Zinc Oxide Tetrapods for Selective Gas Sensing Applications

Lupan

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Gröttrup

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ACS Appl. Mater. Interfaces

136

113

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Multifunctional Materials: A Case Study of the Effects of Metal Doping on ZnO Tetrapods with Bismuth and Tin Oxides

Postica

Gröttrup

Adelung

et al. 2016

Adv Funct Materials

Self Cite

146

112

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Hybrid metal oxide nano-and microstructures exhibit novel properties, which make them promising candidates for a wide range of applications, including gas sensing. In this work, the characteristics of the hybrid ZnOBi 2 O 3 and ZnO-Zn 2 SnO 4 tetrapod (T) networks are investigated in detail. The gas sensing studies reveal improved performance of the hybrid networks compared to pure ZnO-T networks. For the ZnO-T-Bi 2 O 3 networks, an enhancement in H 2 gas response is obtained, although the observed p-type sensing behavior is attributed to the formed junctions between the arms of ZnO-T covered with Bi 2 O 3 and the modulation of the regions where holes accumulate under exposure to H 2 gas. In ZnO-T-Zn 2 SnO 4 networks, a change in selectivity to CO gas with high response is noted. The devices based on individual ZnO-T-Bi 2 O 3 and ZnO-T-Zn 2 SnO 4 structures showed an enhanced H 2 gas response, which is explained on the basis of interactions (electronic sensitization) between the ZnO-T arm and Bi 2 O 3 shell layer and single Schottky contact structure, respectively. Density functional theory-based calculations provide mechanistic insights into the interaction of H 2 and CO gas molecules with Bi-and Sn-doped ZnO(0001) surfaces, revealing changes in the Fermi energies, as well as charge transfer between the molecules and surface species, which facilitate gas sensing.

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A Green Metal–Organic Framework‐Cyclodextrin MOF: A Novel Multifunctional Material Based Triboelectric Nanogenerator for Highly Efficient Mechanical Energy Harvesting

Hajra

Sahu

Padhan

et al. 2021

Adv Funct Materials

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The naturally available cyclodextrin has opened up a wide range of research avenues because of its superior characteristics such as being non‐toxic, biocompatible, and edible. The cyclodextrin is the green multifunctional material that can add to the triboelectric series and extend its self‐powered applications. The ultrasonic synthesized cyclodextrin metal–organic framework (CD‐MOF) designed using sodium as a metal ion and cyclodextrin as a ligand for the triboelectric nanogenerator is reported. The various detailed characterizations of the CD‐MOFs give an insight into the properties of the synthesized material. The Kelvin probe force microscopy suggests three types of CD‐MOFs, exhibiting a positive potential. As per the surface potential, the output of the various CD‐MOF based TENG is varied as alpha CD MOF/Teflon > gamma CD‐MOF/Teflon > beta CD‐MOF/Teflon. The alpha CD MOF/Teflon TENG produces an electrical output of 152 V, 1.2 μA, and 14.3 nC, respectively. The fabricated device output is utilized for powering numerous low‐power electronics through a capacitor and bridge rectifier circuit. The multiunit Z‐shaped TENG device is attached to various surfaces such as the shoe heel and the backside of the school bag, and the corresponding energy harvesting response is demonstrated.

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Three-dimensional flexible ceramics based on interconnected network of highly porous pure and metal alloyed ZnO tetrapods

Cited by 66 publications

References 58 publications

Hybridization of Zinc Oxide Tetrapods for Selective Gas Sensing Applications

Hybridization of Zinc Oxide Tetrapods for Selective Gas Sensing Applications

Multifunctional Materials: A Case Study of the Effects of Metal Doping on ZnO Tetrapods with Bismuth and Tin Oxides

A Green Metal–Organic Framework‐Cyclodextrin MOF: A Novel Multifunctional Material Based Triboelectric Nanogenerator for Highly Efficient Mechanical Energy Harvesting

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