Self-assembly and electrical characteristics of 4-pentynoic acid functionalized Fe3O4-γ-Fe2O3 nanoparticles on SiO2/n-Si

Baharuddin, Aainaa Aqilah; Ang, Bee Chin; Wong, Yew Hoong

doi:10.1016/j.apsusc.2017.06.155

Cited by 6 publications

(1 citation statement)

References 63 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Moreover, the weak and broad 2D and D + G bands at 2680 cm

and 2910 cm

arise from disorder due to formation of oxygen functional groups [ 55 ]. The presence of oxygen functional groups is confirmed by the FTIR spectra ( Figure 4 c) with peaks indicating C=O stretch of COOH groups at 1722 and 1696 cm

, COO

stretch at 1415, 1522, 1575 cm

, O–H deformations of C–OH groups at 1356 cm

, C–O stretch of epoxide groups at 1261 cm

, C–O stretch at 1000–1100 cm

, and C–H bend at 800 cm

[ 56 , 57 ], although some of these bands may be overlapped with vibrational modes of other functional groups. Notably, these IR peaks grow in intensity over the course of 24 h after synthesis, suggesting that the carbon shell formation occurs mostly after laser irradiation is terminated.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of Air-Stable Cu Nanoparticles Using Laser Reduction in Liquid

2021

View full text Add to dashboard Cite

We report the synthesis of air-stable Cu nanoparticles (NPs) using the bottom-up laser reduction in liquid method. Precursor solutions of copper acetlyacetonate in a mixture of methanol and isopropyl alcohol were irradiated with femtosecond laser pulses to produce Cu NPs. The Cu NPs were left at ambient conditions and analyzed at different ages up to seven days. TEM analysis indicates a broad size distribution of spherical NPs surrounded by a carbon matrix, with the majority of the NPs less than 10 nm and small numbers of large particles up to ∼100 nm in diameter. XRD collected over seven days confirmed the presence of fcc-Cu NPs, with some amorphous Cu2O, indicating the stability of the zero-valent Cu phase. Raman, FTIR, and XPS data for oxygen and carbon regions put together indicated the presence of a graphite oxide-like carbon matrix with oxygen functional groups that developed within the first 24 h after synthesis. The Cu NPs were highly active towards the model catalytic reaction of para-nitrophenol reduction in the presence of NaBH4.

show abstract