• WEI ZHANG

Articles written in Bulletin of Materials Science

• Novel D–𝜋–A dye sensitizers of polymeric metal complexes with triphenylamine derivatives as donor for dye-sensitized solar cells: synthesis, characterization and application

Because of being the key component of dye-sensitized solar cells and acting as an important role, dye sensitizer and its synthesis and application has been extensively researched. In this paper, four novel polymeric metal complexes with D–𝜋–A structure that use 4-(octyloxymethyl)-N, N-diphenylbenzenamine as donor group (D), C=N bondasa 𝜋-conjugation linkage (𝜋), and transition metal complexes as an acceptor (A), were functionally designed and synthesized. All the four polymeric metal complexes exhibited some photovoltaic performance, the highest photoelectric conversion efficiency of compound P4 reached 1.09% (𝐽sc = 2.55 mA cm−2, 𝑉oc = 0.61 V and FF = 70.14%) under simulate AM 1.5 G solar irradiation. A new path for the synthesis and study of the dye sensitizer was provided.

• Molecular dynamics study on the relaxation properties of bilayered graphene with defects

The influence of defects on the relaxation properties of bilayered graphene (BLG) has been studied by moleculardynamics simulation in nanometre sizes. Type and position of defects were taken into account in the calculated model. Theresults show that great changes begin to occur in the morphology after introducing defects into BLG sheets. Compared withpoint defects, line defects have a significant effect on the relaxation properties of BLG.

• Preparation and tribological behaviours of graphite self-lubricating coating deposited on middle carbon steel by electrospark deposition

To enhance the tribological performance of the self-lubricating coating, graphite self-lubricating coatings were deposited on middle carbon steel using electrospark deposition (ESD). The microstructure and components have been investigated by scanning electron microscopy images and energy dispersive X-ray spectroscopy analysis. Tribological experiments were carried out on a reciprocating type pin-on-disc tribometer at 5–20 N loads and 200–500 t min$^{–1}$ reciprocating frequency. Results indicated that there was a transition layer between coating and substrate, which should have a thin harder layer at a certain position and can increase the tribological properties of the coating. The graphite coating had better anti-friction and anti-wear performance than uncoated middle carbon steel. The worn surfaces showed that the wear mechanism was changed for graphite coating compared with uncoated middle carbon steel. The wear mechanism of the graphite coating changed from the single abrasive wear to the coexistence of abrasive wear andadhesive wear when reciprocating frequency and load from low to high.

• # Bulletin of Materials Science

Volume 46, 2023
All articles
Continuous Article Publishing mode

• # Dr Shanti Swarup Bhatnagar for Science and Technology

Posted on October 12, 2020

Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
Chemical Sciences 2020