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Self-sacrificial templated synthesis of a three-dimensional hierarchical macroporous honeycomb-like ZnO/ZnCo 2 O 4 hybrid for carbon monoxide sensing
Kaneti Y.V.a, Wulan Septiani N.L.b, Saptiama I.a,c, Jiang X.d, Yuliarto B.b, Shiddiky M.J.A.e, Fukumitsu N.f, Kang Y.-M.g, Golberg D.a,h, Yamauchi Y.i,j
a International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS), Tsukuba, 305-0044, Japan
b Advanced Functional Materials (AFM) Laboratory, Engineering Physics, Institute of Technology Bandung, Bandung, 40132, Indonesia
c Center for Radioisotope and Radiopharmaceutical Technology, National Nuclear Energy Agency (BATAN), South Tangerang, Indonesia
d Department of Chemical Engineering, Monash University, Clayton, 3800, Australia
e School of Environment and Science and Queensland Micro- and Nanotechnology Centre, Griffith University (Nathan Campus), 4111, Australia
f Department of Radiation Oncology, Kobe Proton Center, Kobe, 650-0047, Japan
g Department of Energy and Materials Engineering, Dongguk University-Seoul, Seoul, 04620, South Korea
h School of Chemistry, Physics, and Mechanical Engineering, Science and Engineering Faculty, Queensland University of Technology, Brisbane, 4000, Australia
i School of Chemical Engineering and Australian Institute for Bioengineering and Nanotechnology (AIBN), University of Queensland, Brisbane, 4072, Australia
j Department of Plant and Environmental New Resources, Kyung Hee University, Yongin-si, 446-701, South Korea
[vc_row][vc_column][vc_row_inner][vc_column_inner][vc_separator css=”.vc_custom_1624529070653{padding-top: 30px !important;padding-bottom: 30px !important;}”][/vc_column_inner][/vc_row_inner][vc_row_inner layout=”boxed”][vc_column_inner width=”3/4″ css=”.vc_custom_1624695412187{border-right-width: 1px !important;border-right-color: #dddddd !important;border-right-style: solid !important;border-radius: 1px !important;}”][vc_empty_space][megatron_heading title=”Abstract” size=”size-sm” text_align=”text-left”][vc_column_text]© The Royal Society of Chemistry. This work reports the fabrication of a three-dimensional (3D) zinc oxide/zinc cobaltite (ZnO/ZnCo 2 O 4 ) hybrid with a hierarchical macroporous honeycomb-like structure using highly uniform cobalt glycerate spheres as a self-sacrificial template. In the proposed method, the conversion of the template cobalt glycerate nanospheres into a 3D hierarchical macroporous honeycomb-like ZnO/ZnCo 2 O 4 hybrid is achieved via a facile room-temperature reaction with aqueous zinc nitrate solution, followed by calcination in air at 350 °C. The proposed method offers several benefits including (i) the attainment of the ZnO/ZnCo 2 O 4 hybrid in one step without additional or separate coating steps, (ii) the achievement of a unique 3D hierarchical macroporous honeycomb-like structure with interconnecting nanosheets and macropores which are assembled from smaller mesopores, leading to higher surface area and good interparticle separation, (iii) the relatively low calcination temperature required to obtain the ZnO/ZnCo 2 O 4 hybrid (350 °C) and (iv) potential generalization for the creation of other macroporous honeycomb-like cobalt-based oxide nanostructures (including Al-Co and Cu-Co systems). When evaluated as a sensing material for carbon monoxide (CO), the hierarchical honeycomb-like ZnO/ZnCo 2 O 4 hybrid sensor displays a higher sensing response with enhanced selectivity and stability towards CO gas at 300 °C compared to both ZnO hierarchical spheres and ZnCo 2 O 4 nanospheres. The enhanced sensing performance of the hierarchical honeycomb-like ZnO/ZnCo 2 O 4 hybrid is derived from the synergistic cooperation of the formed p-n heterojunction, large surface area and hierarchical macroporous nature of the as-synthesized ZnO/ZnCo 2 O 4 hybrid. It is expected that the proposed general method may open a new path for creating other hierarchical macroporous honeycomb-like oxide nanostructures with enhanced surface areas and improved functional performance.[/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Author keywords” size=”size-sm” text_align=”text-left”][vc_column_text]Calcination temperature,Functional performance,Honeycomblike structures,Inter-particle separation,Oxide nanostructures,Sacrificial templates,Templated synthesis,Threedimensional (3-d)[/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Indexed keywords” size=”size-sm” text_align=”text-left”][vc_column_text][/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Funding details” size=”size-sm” text_align=”text-left”][vc_column_text]This work was supported by Australian Research Council (ARC) Future Fellowship (FT150100479) and World Class Professor (WCP) program (Grant No. 123.11/D2.3/KP/2018). This work was partly supported by the International Energy Joint R&D Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP), granted nancial resource from the Ministry of Trade, Industry and Energy, Republic of Korea (No. 20168510011350), a collaborative research grant between Dr MACS Bio-Pharma Pvt. Ltd. (India) and QMNC, Griffith University, and the research fund by the Suzuken Memorial Foundation. This work was performed in part at the Queensland Node of the Australian National Fabrication Facility, a company established under the National Collaborative Research Infrastructure Strategy to provide nano-and micro-fabrication facilities for Australia’s researchers. D. G. is grateful to the Australian Research Council (ARC) for granting a Laureate Fellowship FL160100089 and to QUT projects nos 322170-0355/51 and 322170-0348/07. Y. V. K. thanks the Japan Society for Promotion of Science (JSPS) for providing the standard postdoctoral fellowship. I. S. gratefully acknowledges the Program for Research and Innovation in Science and Technology (RISET-Pro) scholarship, provided by the Ministry for Research, Technology and Higher Education, Republic of Indonesia.[/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”DOI” size=”size-sm” text_align=”text-left”][vc_column_text]https://doi.org/10.1039/c8ta11380g[/vc_column_text][/vc_column_inner][vc_column_inner width=”1/4″][vc_column_text]Widget Plumx[/vc_column_text][/vc_column_inner][/vc_row_inner][/vc_column][/vc_row][vc_row][vc_column][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][/vc_column][/vc_row]