Nag Ashish, Frias Batista Laysa Mariela, Tibbetts Katharine Moore
Department of Chemistry, Virginia Commonwealth University, Richmond, VA 23284, USA.
Nanomaterials (Basel). 2021 Mar 23;11(3):814. doi: 10.3390/nano11030814.
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 CuO, 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 -nitrophenol reduction in the presence of NaBH.
我们报道了采用液相自下而上激光还原法合成空气稳定的铜纳米颗粒（NPs）。用飞秒激光脉冲照射乙酰丙酮铜在甲醇和异丙醇混合物中的前驱体溶液以制备铜纳米颗粒。将铜纳米颗粒置于环境条件下，并在长达七天的不同时间进行分析。透射电子显微镜（TEM）分析表明，球形纳米颗粒的尺寸分布较宽，被碳基质包围，大多数纳米颗粒小于10纳米，少数大颗粒直径可达约100纳米。在七天内收集的X射线衍射（XRD）结果证实了面心立方（fcc）-铜纳米颗粒的存在，还有一些非晶态的氧化铜，表明零价铜相的稳定性。拉曼光谱、傅里叶变换红外光谱（FTIR）以及氧和碳区域的X射线光电子能谱（XPS）数据综合表明，在合成后的最初24小时内形成了具有氧官能团的类似氧化石墨的碳基质。在硼氢化钠存在下，铜纳米颗粒对硝基苯酚还原的模型催化反应具有高活性。
