Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Metal Oxide Nanoparticles and Their Applications: A Report   Herein, we report a brief introduction of metal oxide nanoparticles and their
diverse applications in different scientific and medical fields. This report
will be updated frequently to give a complete review in similar fields of
nanotechnology. In the present version of the report, an introduction to
nanotechnology and nanomaterials with some synthesis routes (such as
Hydrothermal synthesis and Sol-Gel synthesis etc.) to prepare the metal oxide
nanoparticles is given. In this version we have primarily included the basic
introduction of application of metal oxide nanoparticles in the fields of
biomedical, resistive switching and photovoltaic etc.

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The categories of this paper are: chem-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: bayes-an
12
The categories of this paper are: nucl-th
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The categories of this paper are: hep-th
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The categories of this paper are: nucl-ex
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The categories of this paper are: funct-an
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The categories of this paper are: astro-ph
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The categories of this paper are: atom-ph
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The categories of this paper are: stat
2
The categories of this paper are: math
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The categories of this paper are: cmp-lg
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The categories of this paper are: eess
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The categories of this paper are: plasm-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: gr-qc