Silver doped diamond-like carbon antibacterial and corrosion resistance coatings on titanium

Investigation of High Voltage Anodic Plasma (HVAP) Ag-DLC Coatings on Ti50Zr with Different Ag Amounts

“…An inverse relationship was found between the Ag content in the film and the force-distance profiles of the surfaces. Comparing the corrosion rate of the Ag-DLC coating on TiZr with the one obtained in previous works [6,7] on other implant materials (such as Tiand CoCr-based alloys, respectively), we have observed that the trend is the same and the Ag-DLC coatings decrease the corrosion representing a promising protection. It should be noted that it is not a comparison in the same conditions for both deposition and electrolyte testing.…”

“…It should be noted that it is not a comparison in the same conditions for both deposition and electrolyte testing. In the previous paper about Ti coated with the same film [7], the increase of Ag is connected to more hydrophilic coating, and such a fact is supposed to be in the favor of a better cell response [31,32].…”

“…TiZr alloys are now being investigated for implant applications due to the exceptional biocompatibility of both Ti and Zr combined with their better mechanical properties compared to pure Zr. The present manuscript's aim is to enhance properties of this alloy using an Ag-DLC coating known from previous works as antibacterial and protective in bioliquids and to test the electrochemical stability and hydrophilic character of coated surface [6,7].…”

The Influence of Plasma-Assisted Production and Milling Processes of DLC Flakes on Their Size, Composition and Chemical Structure

“…This, however, does not change the fact that this area is still valid and numerous researchers continue their studies on other forms of carbon, including diamond-like carbon (DLC). DLC is excellent as a low-friction or anti-wear coating [8,9] especially in medical applications [10,11] and it is often modified by adding various elements, e.g., Si, Ag, F or Ti [12][13][14]. It can also be used for the production of carbon-based fragmented materials, which are usually described in the literature as flakes or powders [15,16].…”

Ag Doped Amorphous Carbon Films: Structure, Mechanical and Electrical Behaviors

“…Key words: amorphous carbon; Ag doping; structure characterization; mechanical property; electrical behavior 非晶碳薄膜(Amorphous carbon, a-C)是主要由 sp 3 碳原子(金刚石结构)和 sp 2 碳原子(石墨结构) 组成一类无定型材料, 由于具有高硬度、良好的 化学惰性、优异的摩擦性能和生物相容性等优点, 在刀模具、信息存储、生物、航空航天等领域得 到了广泛应用 [1][2] 。然而, a-C 薄膜由于热稳定性 差、残余应力高、膜基结合力差, 产业化应用受 到一定限制。通过成分、结构设计, 将金属元素 引入非晶碳基质, 可以克服上述缺点, 获得金属 掺杂非晶碳膜, 并赋予材料新型功能特性, 因而 引起了广泛关注 [3][4][5][6] 。 其中, Ag 掺杂非晶碳膜(a-C:Ag)表现出较低的 应力 [7] 、优异的耐蚀 [8] 和摩擦性能 [9] , 并且由于纳米 Ag 颗粒的存在, a-C:Ag 在场发射 [10] 、压阻传感 [11] 等领域表现出巨大的应用潜力。鉴于 Si 基半导体器 件的广泛应用, 在 Si 基体上制备低应力机械强度较 高的 a-C:Ag 薄膜具有重要的实际意义 [12][13] 。此外, 目前主要基于复合材料的"渗流理论"模型 [14][15] 对 a-C:Ag 的电学行为进行定性分析, 但是无法解释低 Ag 含量下, Ag 原子"固溶"的非晶碳基质薄膜的载流 子输运行为, 也难以解释高 Ag 含量下, 不同尺寸和密 度 Ag 纳米晶对于 a-C:Ag 载流子输运行为的影响。 本工作采用反应磁控溅射技术, 通过改变溅射 靶电流制备了 Ag 含量在 0.7at%~41.4at%的 a-C:Ag 薄膜, 系统研究了 Ag 掺杂量对薄膜组分、 结构和机 械性能的影响, 并重点探究了薄膜的电学行为以及 相关载流子输运特性。 [16] 。特别地, 随溅射电流由 1.5 A 增大到 1.6 A, 可能由于入射 Ar + 能量和密度等变化, 引起 Ag 溅射产额的急剧增大, 导致薄膜中的 Ag 含量增加, 同时由于溅射出的 Ag 原子数量增大, 导致相同沉积时间内, 薄膜厚度显 著增大 [17][18] 。 图 1 为不同 Ag 含量 a-C:Ag 薄膜 C1s 精细谱图 以及 Ag 含量为 41.4at%的薄膜的 Ag 3d 精细谱图。 根据 C1s 精细谱图可知, Ag 含量增加导致 C1s 峰强 表 1 Ag 掺杂含量、O 含量、薄膜厚度和沉积速率随溅射电流和功率的变化关系 [25][26] , 本研究中随 Ag 含量 从 0. 拉曼测试下, sp 2 C 散射截面是 sp 3 C 的 50~230 倍 [22] ; 此外, 高 Ag 含量的薄膜中存在的 Ag 纳米颗粒会导 致拉曼增强效应 [27] , 同时其 G 峰位置向高波数移动, 从 1533 cm 1 移动到 1580.…”