Outcome：

2023
The new sp-sp2 (-CC-CC-) hybridized materials such as graphyne, graphdiyne, hydrogen substituted graphdiyne and nitrogen substitute graphdiyne are recently gaining attraction because of their unique properties, such as highly-ordered pore structure, tunable bandgap, extended π-conjugation and chemical tailorability [1]. Among those, hydrogen substituted graphdiyne (HSGDY) can be easily synthesized with 1,3,5 tri-ethynylbenzene (TEB) molecule and it shows excellent physical-chemical stability. The three H atoms in the benzene ring and -CC-CC- bonds provide unique properties to HsGDY that endows many applications in sensors, energy, catalysts, medicine and environment remediation [2]. Earlier synthesis methods use copper foil as a substrate [3]. In most of the reports, particle/network morphology with amorphous or crystalline structure is demonstrated [3]. These disordered structural arrangements are due to unordered or uncontrolled cross-coupling reactions between adjacent TEB monomers. Synthesis of high-quality HsGDY is still lacking due to its low production rate and unordered cross-coupling reactions [4]. Recently, the direct synthesis of graphydiyne over various substrates is demonstrated with polyvinylpyrrolidone/copper acetate film as a catalyst and good structural morphology was obtained over a range of substrates [5]. The present work is focused to grow HsGDY directly on SiO2 and fluorine doped tin oxide glass (FTO) substrates. In Fig.1(a), the CC bonds and the G band has appeared at 2220 cm-1 and 1581 cm-1 on both substrates. Compared to SiO2, FTO glass have more defects (broad D peak). Hence, HsGDY is formed on SiO2 and FTO glass substrates. The AFM topography shows the networked structure with agglomerated small particles. The particle size (70 and 180 nm) and film thickness (250 nm and 490 nm) are for SiO2 and FTO glass substrates, respectively. The electrical and thermal properties of the grown HsGDY film will be analyzed in detail. The results were presented in the 84th JSAP autumn meeting, Kumamoto (Japan), (2023.9).

2023
Photocatalytic dye degradation of methylene blue dye using Hydrogen-substituted gaphdiyne coated Cu2O nanowire (HsGDY@Cu2O) photocatalyst. This photocatalyst is a greener remedy for environmental purification because it can be reused without any post-treatment process. The results were presented Annual Meeting of the Japan Society of Vacuum and Surface Science 2023, Nagoya (Japan), (2023.10).

Event date： 2023.3

Presentation type：Oral presentation (general)  

Event date： 2023.9

Presentation type：Oral presentation (general)  

Event date： 2023.10 - 2023.11

Presentation type：Oral presentation (general)  

Presentation type：Oral presentation (general)