Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Nitrogenated CQD decorated ZnO nanorods towards rapid photodegradation
  of rhodamine B: a combined experimental and theoretical approach   In this work, hybridization of nonmetal nitrogen-doped carbon dots (NCQDs)
with ZnO nanorods (NRs) is utilized towards better photocatalytic degradation
of rhodamine B under ultraviolet (UV) irradiation. The structural
characterization is confirmed by XRD, XPS, FTIR and HRTEM measurements, while,
optical properties have been investigated using UV-visible absorbance
spectroscopy and photoluminescence study. The dye degradation using ZnO NR is
recorded as ~69%, while the performance of ZnO/NCQD climbs up to ~90%, after
nine minutes of UV irradiation. Furthermore, the reusability test suggests
better stability of ZnO/NCQD than bare ZnO under photocorrosion. The cyclic
voltammetry study confirms that the photoinduced electron-hole pairs originate
from the heterojunction established between the interfaces of NCQD and ZnO. An
insight on the photocatalytic excellence of ZnO/NCQD system is drawn from the
density functional theory study. This indicates that appropriate band alignment
of the heterostructure constituents is the key factor in this experimental
attempt towards environment remedy.

14
The categories of this paper are: math-ph
6
The categories of this paper are: astro-ph
3
The categories of this paper are: physics
32
The categories of this paper are: atom-ph
19
The categories of this paper are: eess
35
The categories of this paper are: mtrl-th
25
The categories of this paper are: patt-sol
12
The categories of this paper are: nucl-th
0
The categories of this paper are: hep-ph
10
The categories of this paper are: q-bio
37
The categories of this paper are: supr-con
7
The categories of this paper are: hep-th
17
The categories of this paper are: q-fin
24
The categories of this paper are: dg-ga
27
The categories of this paper are: comp-gas
26
The categories of this paper are: bayes-an