Depositing Pt nanoparticles on crumpled Ti3C2Tx for enhanced electrochemical sensing
Peer-Reviewed Publication
Updates every hour. Last Updated: 23-Jul-2025 14:10 ET (23-Jul-2025 18:10 GMT/UTC)
Dopamine plays a crucial role in regulating various brain functions, making the development of highly sensitive detection methods and precise quantitative analysis. techniques of great significance. However, realizing highly selective and sensitive detection of dopamine in complex biological environments remains a challenge. Here, we prepared 3D crumpled Ti3C2Tx structures loaded with Pt nanoparticles (Pt/Na- Ti3C2Tx) by wet chemical reduction and ion intercalation. The synergistic coupling between Pt nanoparticles and MXene support facilitates efficient electron transfer between dopamine and the electrode surface, thereby improving the sensing performance of dopamine. Furthermore, this wrinkled structure not only enhances the specific surface area by inhibiting the stacking of layered Ti3C2Tx nanosheets, but also effectively prevents the agglomeration of nanoparticles. The experimental results showed that Pt/Na- Ti3C2Tx possessed a wide linear range (0.1-100 μM), a low detection limit (0.029 μM), and a high sensitivity (0.556 μAμM-1cm-2). This work proposes an innovative strategy for achieving highly sensitive dopamine detection while advancing the utilization of MXene-based nanocomposites in electrochemical sensor development.
Micro-supercapacitors (MSCs) face significant limitations due to low energy density despite their high power density and long cycle life. In this study, single-layer Ti3C2Tx nanosheets are employed to fabricate a MXene-hydroxylated nanocellulose-carbon nanotube (MHC) composite ink, which is used to fabricate high-energy flexible MSCs via direct ink writing 3D printing technology. The introduction of the rheological modifier hydroxylated nanocellulose (HNC) not only constructs interlayer spacers to inhibit nanosheet restacking but also optimizes the rheological properties and 3D printability of the composite ink. Meanwhile, the synergistic effect of carbon nanotubes (CNTs) as conductive agents enhances interlayer electron transport and electrochemical performance. Benefiting from the rational design of the ink and printing process, the fabricated MSCs exhibit high-precision structures (electrode width of 250 μm, electrode area of 0.2625 cm2) and outstanding energy storage properties, achieving 543 mF cm-2 areal capacitance, 27.15 μWh cm-2 energy density, and 6 mW cm-2 power density, significantly surpassing previously reported MXene-based MSCs. Moreover, the flexible all-solid-state MSCs demonstrate excellent performance stability under mechanical bending, series/parallel module integration, and long-term cycling tests, providing a customizable energy storage solution for flexible wearable microelectronic systems.
“From expert to expert” - this is the motto of the 13th round of the BfR Summer Academy. From 30 June to 11 July 2025, the 23 participants of the courses in Berlin will be focusing on the topics of food safety and risk assessment: How is the legal and institutional background of food safety regulated in Germany and Europe? What characterises a well-founded risk assessment? And what needs to be considered when communicating health risks? “The 13th BfR Summer Academy will focus on mutual exchange and international networking. After all, food safety is a global challenge today. It doesn’t stop at borders. This makes it all the more important to jointly promote consumer health protection and thus protect the population from food-related diseases in the best possible way,” says Professor Andreas Hensel, President of the BfR.
Metal-organic frameworks (MOFs) are characterized by high porosity and structural versatility. They have enormous potential, for example for applications in electronics. However, their low electrical conductivity has so far greatly restricted their adoption. Using AI and robot-assisted synthesis in a self-driving laboratory, researchers from Karlsruhe Institute of Technology (KIT), together with colleagues in Germany and Brazil, have now succeeded in producing an MOF thin film that conducts electricity like metals. This opens up new possibilities in electronics and energy storage – from sensors and quantum materials to functional materials. The team reports in the Materials Horizons journal. (DOI: 10.1039/d5mh00813a)