Tunable band gap energy of single-walled zigzag ZnO nanotubes as a potential application in photodetection

Efficient Photodegradation of Eriochrome Black-T by a Trimetallic Magnetic Self-Synthesized Nanophotocatalyst Based on Zn/Au/Fe-Embedded Poly(vinyl alcohol)

“…The highest energy gap was attained in the order of ZnO NRs, Fe 3 O 4 NPs, and the Fe 3 O 4 @PVA–Au/ZnO magnetic photocatalytic system. The electron transition from the valence band (VB) to the conduction band (CB) of Au with a band gap value of 3.4 eV provides exciton (electron–hole pairs). , According to the literature, the calculated band gap energy of the individual ZnO and Fe 3 O 4 was about 3.2 and 2.3 eV, respectively. , In this regard, the possible proposed mechanism clarifies that the photocatalyst procedure of the Fe 3 O 4 @PVA–Au/ZnO magnetic photocatalytic system can be initiated under the green LED light irradiation. Afterward, the electron transfer from the VB to the CB leads to positive and negative charges on the photocatalyst’s energy levels. , Accordingly, many studies have focused on TiO 2 application with the main photocatalytic activity as the mechanism. , Based on the proposed mechanism and the similar energy levels of CB in Au NPs and ZnO, the LSPR-excited electrons (as previously described) of the Au NPs transfer from the CB of Au NPs to the CB of ZnO, generating the same amount of holes in VB of Au NPs.…”

“…67,68 According to the literature, the calculated band gap energy of the individual ZnO and Fe 3 O 4 was about 3.2 and 2.3 eV, respectively. 69,70 In this regard, the possible proposed mechanism clarifies that the photocatalyst procedure of the Fe 3 O 4 @PVA−Au/ZnO magnetic photocatalytic system can be initiated under the green LED light irradiation. Afterward, the electron transfer from the VB to the CB leads to positive and negative charges on the photocatalyst's energy levels.…”

Suppressing the shuttle effect in lithium‐sulphur batteries by defective single‐walled ZnO nanotube: A DFT study

“…All the calculations were implemented by utilizing the DMol 3 module based on DFT. [ 32 ] The generalized gradient approximation (GGA) with exchange‐correlation functional parameterized by Perdew‐Burke‐Ernzerh function (PBE), which has a double numerical polarization (DNP) basis set, was used to calculate the exchange‐correction function. [ 33 ] The DFT semi‐core pseudopotential (DSSP) was used to manage the core, and valence electrons, and the DFT‐D2 method proposed by Grimme was used to calculate long‐range van der Waals (vdW) interactions.…”

Synthesis of ZnO Tetrapods Using Atmospheric Plasma Jet and Their Size-Dependent Photosensing Properties

“…Zinc oxide (ZnO), a direct and wide bandgap (3.37 eV) n-type semiconductor with a high exciton binding energy of 60 meV has been studied as one of the most important metal oxides, owing to its unique and excellent optical and physical properties [1][2][3][4]. ZnO nanowires and rods, in particular, have been extensively investigated for application in light-emitting diodes, sensors, and energy-harvesting elements such as piezoelectrics and solar cells [5][6][7][8][9][10][11][12][13][14][15]. A high on/off current ratio, fast response and recovery, and large photocurrent are desirable properties for sensors used in photosensing applications.…”

“…However, ZnO nanomaterials exhibit relatively poor photocurrent response against ultraviolet (UV) light irradiation, which is a critical unsolved issue. To date, many researches have focused on methods to overcome this issue, including large-sized ZnO nanomaterial synthesis, use of a parallel array of ZnO nanowires, doping of foreign elements, and formation of nanocomposites with other components such as carbon nanotubes, graphene, and reduced graphene oxide [8][9][10][11][12][13][14]. Mishra and Adelung et al [15][16][17] developed an approach involving the direct synthesis of hierarchical ZnO structures such as tetrapods, as a unique route to obtain high connectivity by diminishing the contact resistance, and some excellent results on gas sensing were reported using the technique.…”