Electrospun cellulose acetate nanofibers and Au@AgNPs for antimicrobial activity - A mini review

Ag nanoparticles/Mo–Ag alloy films with different Ag contents were prepared on polyimide by magnetron sputtering. The effects of Ag contents on the microstructure of self-grown Ag nanoparticles/Mo–Ag alloy films were investigated using XRD, FESEM, EDS and TEM. The Ag content plays an important role in the size and number of uniformly distributed Ag nanoparticles spontaneously formed on the Mo–Ag alloy film surface, and the morphology of the self-grown Ag nanoparticles has changed significantly. Additionally, it is worth noting that the Ag nanoparticles/Mo–Ag alloy films covered by a thin Ag film exhibits highly sensitive surface-enhanced Raman scattering (SERS) performance. The electric field distributions were calculated using finite-difference time-domain analysis to further prove that the SERS enhancement of the films is mainly determined by “hot spots” in the interparticle gap between Ag nanoparticles. The detection limit of the Ag film/Ag nanoparticles/Mo–Ag alloy film for Rhodamine 6G probe molecules was 5 × 10−14 mol/L. Therefore, the novel type of the Ag film/Ag nanoparticles/Mo–Ag alloy film can be used as an ideal SERS-active substrate for low-cost and large-scale production.

Section: Characterization Of the Agmentioning

confidence: 99%

Effects of Ag contents on the microstructure and SERS performance of self-grown Ag nanoparticles/Mo–Ag alloy films

Lian

Sun

et al. 2020

“…Nanocomposites have attracted much attention due to their exceptional properties [17,[24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41]. Mechanical performance and electrical conductivity are the main characteristics that are developed with the combination of various materials into a nanocomposite [42][43][44][45][46].…”

Section: Introductionmentioning

confidence: 99%

A highly sensitive biosensor based on methacrylated graphene oxide-grafted polyaniline for ascorbic acid determination

Naghib

Behzad

Rahmanian

et al. 2020

Functionalized graphene-based nanocomposites have opened new windows to address some challenges for increasing the sensitivity, accuracy and functionality of biosensors. Polyaniline (PANI) is one of the most potentially promising and technologically important conducting polymers, which brings together the electrical features of metals with intriguing properties of plastics including facile processing and controllable chemical and physical properties. PANI/graphene nanocomposites have attracted intense interest in various fields due to unique physicochemical properties including high conductivity, facile preparation and intriguing redox behavior. In this article, a functionalized graphene-grafted nanostructured PANI nanocomposite was applied for determining the ascorbic acid (AA) level. A significant current response was observed after treating the electrode surface with methacrylated graphene oxide (MeGO)/PANI nanocomposite. The amperometric responses showed a robust linear range of 8–5,000 µM and detection limit of 2 µM (N = 5). Excellent sensor selectivity was demonstrated in the presence of electroactive components interfering species, commonly found in real serum samples. This sensor is a promising candidate for rapid and selective determination of AA.

“…With the increasingly severe service conditions of microdevices, the requirements for the performance of the thin-film materials have gradually increased, leading to extensive applications such as nonenzyme glucose sensors [1], highstrength and high-conductivity films [2], antibacterial films [3], semiconductor interconnect [4], wear-resistant films [5], packaging film materials [6] and so on. There are many methods to prepare thin films, such as electrical deposition [7], arc evaporation [8], wet-laid and spunlace process [9], arc discharge [10] and son on [11], but these methods are not suitable for preparing low solid solubility alloy films. Magnetron sputtering has become an important method for preparing thin films due to its fast speed and good uniformity [12].…”

Section: Introductionmentioning

confidence: 99%

Effects of substrate properties and sputtering methods on self-formation of Ag particles on the Ag–Mo(Zr) alloy films

Sun

Lian

Huang

et al. 2020

This article studies two different sputtering methods for depositing Ag–Mo and Ag–Zr alloy films on single crystal silicon (Si), flexible polyimide (PI) and soda-lime glass substrates. The phase structure and the surface morphology of the Ag–Mo(Zr) alloy films were characterized by XRD, SEM and EDS. The effects of substrate properties and sputtering methods on the self-grown Ag particles on the Ag–Mo(Zr) alloy films were investigated. As the result of the experiment, nanoscale Ag particles were formed on the surface of Ag–Mo(Zr) alloy films. However, the size and the number of self-formed Ag particles on the Ag–Mo(Zr) alloy film on the PI substrate are significantly different from that on the Si substrate and glass substrate. This outcome is closely related to the different thermal stress evolution behaviors of the alloy films on different substrates during annealing.