1.Biosensor for detecting mercury ions in aqueous solution
Considering the impact of mercury on the environment and the need for simple methods to detect mercury, many attempts have been made to develop reliable sensors based on PtNPs. Because Hg2- can inhibit the catalytic activity of PtNPs, Zeng Jiahong et al. Developed a biosensor for the detection of mercury ions in aqueous solutions by converting primary color substrates into colored substrates under Au / PtNP catalysis. The interaction of Hg2- with the surface of Pt / AuNPs caused the enzyme activity of ptNPs to change from HRP-like to CAT-like, thereby inhibiting the production of phosphor [1]. Detection of Hg2- with TMB and BSA embedded PtNPs has higher selectivity and sensitivity.
2.Detection of ofloxacin in tablets and human urine
RGO / AuPt nanocomposites were prepared by a simple electrochemical reduction method. The synergistic electrocatalytic effect of AuPt bimetal nanoclusters and rGO on ofloxacin was studied. The sensor has high electrocatalytic activity for OFL and has many excellent properties. This study can provide a reference for the electrochemical sensing research of conductive graphite-based nanocomposites [2].
3. Catalyst
(1) An AuPt @ BGNs / Fe3O4 multifunctional nano-catalyst with good magnetic properties and excellent catalytic activity was prepared by a self-assembly method. BGNs / Fe3O4 as a nanocarrier can not only effectively load AuPt nanoalloys, but also significantly improve the catalytic activity of AuPt nanoalloys for the reduction of 4-nitrophenol (4-NP). And the multifunctional nanocatalysts with these advantageous characteristics can have a wide range of potentials in other fields of catalytic reactions and biosensing [3].
(2) In the polyelectrolyte multilayer membrane (PEMU), the ion-exchange / in-situ reduction cycle combined with seed-mediated growth process, the results of polyelectricity show that compared with single metal Pt, Pt and Au nanoparticles have more Good electrocatalytic efficiency, resistance to poisoning and long-term stability, with synergistic effects. Pemu supported Pt and Au nanoparticles can be used as anode catalysts for direct methanol fuel cells. Synthesis of gold-modified Pt (Pt ^ Au) nanoparticles in a degraded multilayer film (PEMU) [4].
(Remarks: Platinum alloys are widely used as catalysts for various reactions due to their high catalytic activity, such as the electrooxidation of methanol, formic acid, and ethanol. Here are just a few examples for introduction.)
4. Near-cell detection for cancer cells
By using ionic liquid as an electrolyte to electrodeposit 3D porous graphene on activated carbon fibers, and modified with bi-metal PtAu nano-flowers, a composite nano-hybrid electrode was formed. The electrode showed good sensing performance and can be used to evaluate the normal state Later, the levels of H2O2 secreted by different female cancer cells are used for the treatment of antitumor drugs. And it is envisaged that the wider application of this strategy will help develop the next generation of minimally invasive implanted devices, compact diagnostic instruments and wearable medical monitoring devices [5].
5.Alcohol sensor
Au-Pt alloy NPs were prepared on a ITO glass substrate by a simple electrodeposition method and used as a model catalyst to study the electro-oxidation of methanol in 0.5M KOH supporting electrolyte. The catalytic activity of Au-Pt alloy NPs is high, which further proves that these Au-Pt alloy nanoparticles can be used as high-performance alcohol sensors for analyzing the alcohol concentration in solution [6].
6.As an electrocatalyst for fuel cells
In the presence of sodium citrate, PtAu alloy nanoparticles were synthesized by a co-reduction method. The catalytic activity of carbon-supported PtAu alloy electrocatalyst for formic acid oxidation is much higher than that of Pt / C electrocatalyst. This can be attributed to the "bulk" effect of Pt in PtAu alloy nanoparticles, which facilitates the direct oxidation of formic acid. In addition, due to the presence of Au, PtAu / C electrocatalysts also exhibit higher electrochemical stability than Pt / C. Can improve the activity and stability of anode catalysts for direct formic acid fuel cells [7].
7.As a biosensor for glucose quantification
A novel electrochemical GOD biosensor based on PtAuNP / ss-DNA / GR nanocomposite. The composite membrane provides a suitable microenvironment, can effectively display a large amount of enzyme load, and enhance the direct relationship between the enzyme active site and the electrode Electron transfer [8].
Material performance advantages
Low cost, high catalytic efficiency, good stability, good biocompatibility, and synergistic effect
Application prospects
Sensor
Glucose sensor, alcohol sensor
Catalyst
Widely used in fuel cells