A biocompatible and highly-stable nanoporous electrode is demonstrated herein. was studied neuron-based sensors and neuronal networks . Recently, we have reported on a facile fabrication technique to produce three-dimensional nano-carbon structures with properties comparable with diamond  (Figure 1). We have successfully coated the entire surface of nanoporous anodic alumina (AAO) with diamond-like carbon (the detailed fabrication technique can be found elsewhere ). AAO is a nanoporous structure with tunable Vandetanib irreversible inhibition chemical and physical properties, which can be easily fabricated at a large scale with a straight-forward electrochemical process . However, practical biomedical applications of AAO are scarce due to poor (bio-)chemical stability of the oxide . The conformal coating of AAO with an ultra-thin DLC layer greatly enhances its chemical stability and non-cytotoxicity [14,33]. The chemically stable and non-cytotoxicity nanoporous DLC-AAO provides unique features for range of biomedical and biological applications such as bionic devices, 3D scaffolds, membrane for cell growth and nerve repair . Open in a separate window Figure 1 The entire surface of nanoporous anodic alumina (AAO) is coated with an ultrathin diamond-like carbon layer. Here, we provide a brief summary from the properties from the covered components, and present the result on neural development for the fabricated membranes. The outcomes claim that DLC-AAO using its three-dimensional nanocarbon framework Vandetanib irreversible inhibition includes a great guarantee for applications in bionic electrodes and 3D cell tradition. 2. Discussion and Results 2.1. Conductivity from the Electrodes The conductivity of the carbon covered AAO electrode varies from 10 to 200 k, with regards to the atomic framework from the carbon coating. Basically, the percentage of the sp2/sp3 bonded carbon atoms determines the conductivity from the coating (applications especially need components that exhibit superb balance in the natural environment. Some research have proven that AAO (or revised AAO) could be steady under moderate physiological circumstances and presents negligible cytotoxicity [35,36,37,38,39,40]. Nevertheless, for a few bio-device processing reasons (e.g., sterilization or functionalization) it really is desirable to truly have a materials that may tolerate slightly more powerful acid or fundamental environments with minimum amount structural problems. The sp3-bonded carbon components, alternatively, are famous for their chemical substance resistance. Table 1 shows the results of chemical resistance of AAO and DLC-AAO films in comparison to diamond and sapphire. DLC-AAO demonstrated excellent corrosion resistance against all tested chemicals with no signs of degradation, similar to diamond, whereas AAO was completely etched in those acidic/basic conditions. Sapphirethe strongest chemical form of aluminawas partly damaged in some corrosion tests, such as in the acid/alkali boil experiments. Figure 2 (bottom row) shows the SEM images of DLC-AAO and sapphire after boiling in NaOH. Table 1 Comparison of (bio-)chemical resistance of anodic alumina (AAO), sapphire, diamond-like carbon-anodic alumina (DLC-AAO) and diamond. (C)life span; ** Resistant: Impervious to the specific chemical during the chemical test (unchanged); Damaged: Structural damage caused to the surface during the chemical test; Etched: Fully dissolved Vandetanib irreversible inhibition during the chemical test. Open in a separate window Figure 2 DLC-AAO and sapphire after wet/dry chemical etching. DLC-AAOs structure did not change after etching, while sapphires surface was damaged. Alternatively, the DLC-AAO membrane resisted severe chemical substance attacks actually at an increased temperature up to 200 C (acidity boil test). The acidity boil treatment can be a technique regularly found in the gemstone community to completely clean off any residual pollutants and sp2-bonded carbon from gemstone surface area. This result obviously demonstrates the conformal layer of DLC coating is the main factor for the chemical substance balance of DLC-AAO membranes. The slim, however conformal DLC layer, confers the chemical substance stability from the membrane, ensuing a framework which can be resistant to selection of chemical substances (1 pH 14). The Vandetanib irreversible inhibition wonderful corrosion resistivity could be good for gadget fabrication procedure also, allowing using various chemical substances for different reasons, such as for example sterilization or functionalization. Plasma treatment continues to be used broadly for layer or surface area washing from the biomedical products, especially for the purposes of sterilization. Therefore, biodevices should ideally be resistant to plasma-assisted dry chemical processes. The stability of the proposed electrodes against dry etching was tested using a plasma reactor. Hydrogen plasma BSPI (60 Torr, 760 sccm and 1500 W power) was used to test the resistance of the materials to plasma etching. Figure 2 (top row) shows SEM images of DLC-AAO and sapphire after plasma etching, which clearly suggests that alumina (even in its strongest chemical form) is not as resistive as DLC coated alumina against dry etching. To test the bioresistivity of the fabricated sensors, the samples were soaked in medical grade sterile saline using an environmental test chamber for.