In this work, a facile and controllable method to fabricate high-density silver nanofilaments (Ag NFs) from $\mathrm{\beta }$-silver sulfide ($\mathrm{\beta }$-Ag${}_{\mathrm{2}}$S) for surface-enhanced Raman scattering (SERS) substrates was reported. The $\mathrm{\beta }$-Ag₂S crystal structure affects the growth of Ag NF significantly. The optimal silver nanofilaments with a density of 5.93 × 10⁹ NF/cm ² and length of $0.46\pm 0.04\mathrm{\mu }\mathrm{m}$ were formed when the $\mathrm{\beta }$-Ag₂S substrate was irradiated by a 20kV electron beam for 10 min. The Ag NF substrate possesses the SERS enhancement factor (EF) of 1.57 × 10⁶ at 1 mM Methylene blue (MB), nevertheless, the detection limit for Methylene blue can reach up to 1.18 × 10⁻¹¹ M. It was found that by controlling the accelerating voltage and irradiation time, the surface morphology of the Ag NFs as SERS substrates can be tailored to obtain the optimal SERS EF. The simple yet controllable method presented here opens a new path to fabricate Ag nanofilament SERS substrates for ultra-low chemical concentration analysis.

在这项工作中，一种简便且可控的方法可从中制备高密度银纳米丝（Ag NFs） $\mathrm{\beta }$-硫化银（$\mathrm{\beta }$-银${}_{\mathrm{2个}}$报道了用于表面增强拉曼散射（SERS）衬底的S）。这$\mathrm{\beta }$Ag ₂ S晶体结构显着影响Ag NF的生长。最佳银纳米丝，其密度为5.93×10 ⁹ NF / cm ²，长度为$0。46\pm 0。04\mathrm{\mu }\mathrm{米}$ 是在 $\mathrm{\beta }$-Ag ₂ S底物用20kV电子束辐照10分钟，Ag NF底物在1 mM亚甲基蓝（MB）时的SERS增强因子（EF）为1.57×10 ⁶，但亚甲基蓝的检出限可以达到1.18×10 ^-11M。通过控制加速电压和照射时间，可以调整作为SERS衬底的Ag NFs的表面形貌，以获得最佳的SERS EF。本文介绍的简单但可控的方法为制造用于超低化学浓度分析的Ag纳米丝SERS底物开辟了一条新途径。