Self-Assembled Ag-Cu2O Nanocomposite Films at Air-Liquid Interfaces for Surface-Enhanced Raman Scattering and Electrochemical Detection of H2O2

Abstract

We employ a facile and novel route to synthesize multifunctional Ag-Cu2O nanocomposite films through the self-assembly of nanoparticles at an air-liquid interface. In the ethanol-water phase, AgNO3 and Cu(NO3)2 were reduced to Ag-Cu2O nanoparticles by NaBH4 in the presence of cinnamic acid. The Ag-Cu2O nanoparticles were immediately trapped at the air-liquid interface to form two-dimensional nanocomposite films after the reduction reaction was finished. The morphology of the nanocomposite films could be controlled by the systematic regulation of experimental parameters. It was found that the prepared nanocomposite films serving as the substrates exhibited strong surface-enhanced Raman scattering (SERS) activity. 4-aminothiophenol (4-ATP) molecules were used as the test probes to examine the SERS sensitivity of the nanocomposite films. Moreover, the nanocomposite films synthesized by our method showed enhanced electrocatalytic activity towards hydrogen peroxide (H2O2) and therefore could be utilized to fabricate a non-enzymatic electrochemical H2O2 sensor.

Research Progress of Biomimetic Self-assembly of Nanomaterials in Morphology and Performance Control

“…与单个金属纳米粒子相比，组装体由于耦合作 用引起电磁场局部增强，形成的拉曼散射强度高达 六个数量级， 具有更高的表面增强拉曼散射 (SERS) [87] ，是强有力的化学和生物传感现象 [88] 。Ma 等 [89] 制备了由金纳米颗粒在环己烷/水界面处自组装形 成的表面增强拉曼平台，用于农药残留量检测。在 环己烷/水双相界面，以亲水性十六烷基三甲基溴化 铵包覆的金纳米棒为自组装基元，形成的二维阵列 能极大地增强 SERS，由此获得的便携式拉曼光谱 仪可以检测人体尿液中极低含量的甲基苯丙胺，为 毒品的快速侦查提供帮助 [90] 。此外还有金纳米粒子 组装胶带，可用于检测鱼表面残留的孔雀石绿 [91] ； 金/银纳米球自组装单分子膜可检测三苯基甲烷染 料 [92] ； 采用银/氧化亚铜自组装纳米复合薄膜制作非 酶电化学 H2O2 传感器 [93] 。 强的 SERS 效应主要集中于 Au [94] 、Ag [95] 和 Cu 等金属 [96][97] ，但这些金属材料成本较高，且稳定性 不理想 [98] ，生物相容性差 [99] ，急需替代 SERS 的材 料 [100] 。 Lan 等 [101] 报道了基于石墨烯量子点和 Mn3O4 的自组装复合材料，具有较好的 SERS 效应。Yi 等 [102] 开发了基于紧密堆积的 SiO2 球形颗粒实现 SERS 的技术，在表面化学、生物学和微电子学等 领域都有潜在的应用。除传统材料外，新型二维层 状材料 MXene [103] 同样可以用于 SERS。Chen 等 [104] 研究了磺胺酸改性 MXene，表明的其潜在 SERS 应 用价值。…”

Self-Cleaning-Mediated SERS Chip Coupled Chemometric Algorithms for Detection and Photocatalytic Degradation of Pesticides in Food

“…24 However, compared with Au or Ag nanostructures, Cu 2 O-based SERS sensors produce weaker SERS signals. 25 In addition, the photocatalytic ability of Cu 27 Additionally, Ag NPs can inhibit photocorrosion and recombination of photogenerated electron−hole pairs, which is beneficial for the enhancement of photocatalytic efficiency. 28 Therefore, many researchers have focused on the SERS or photocatalytic activity of the combination of Cu 2 O and Ag NPs.…”

“…In addition, the photocatalytic ability of Cu 2 O is usually limited by photoelectron and hole separation and poor light stability caused by self-light corrosion . To improve the SERS performance of Cu 2 O and extend its photocatalytic application, a good Raman enhancer such as Ag NPs in combination with Cu 2 O can result in high SERS intensity under the mutual effect of electromagnetic enhancement and chemical enhancement . Additionally, Ag NPs can inhibit photocorrosion and recombination of photogenerated electron–hole pairs, which is beneficial for the enhancement of photocatalytic efficiency .…”

Hydrogen Peroxide Detection by Super-Porous Hybrid CuO/Pt NP Platform: Improved Sensitivity and Selectivity

“…Various techniques have been developed for the H 2 O 2 detection including the colorimetric assay [ 3 , 4 ], fluorescence detection [ 5 , 6 ], electrochemical luminescence [ 7 , 8 ], surface-enhanced Raman spectroscopy (SERS) [ 9 , 10 ] etc. Among these, electrochemical sensing [ 11 ] can offer one of the handiest approaches for the detection of H 2 O 2 due to its high sensitivity, fast response, precision and simple operation.…”