Reversible cation exchange on macroscopic CdSe/CdS and CdS nanorod based gel networks.

  title={Reversible cation exchange on macroscopic CdSe/CdS and CdS nanorod based gel networks.},
  author={Franziska L{\"u}bkemann and Pascal Rusch and Sven Getschmann and Bj{\"o}rn Schremmer and Malte Sch{\"a}fer and Marcel Schulz and Bastian Hoppe and Peter Behrens and Nadja C. Bigall and Dirk Dorfs},
Over the past decades, cation exchange reactions applied to nanoparticles have opened up synthetic pathways to nanocrystals, which were not accessible by other means before. The limitation of cation exchange on the macroscopic scale of bulk materials is given by the limited ion diffusion within the crystal structure. Lyogels or aerogels are macroscopic, highly voluminous, porous materials composed of interconnected nanoscopic building blocks and hence represent a type of bridge between the… Expand
6 Citations
Aerogelation of Polymer-Coated Photoluminescent, Plasmonic, and Magnetic Nanoparticles for Biosensing Applications
The surface modification and assembly of various building blocks are reported on: photoluminescent nanorods, magnetic nanospheres, and plasmonic nanocubes with particle sizes between 5 and 40 nm, with nanoscopic properties retained in the monolithic aerogels, leading to the powerful transfer of these properties to the macroscale. Expand
Control over Structure and Properties in Nanocrystal Aerogels at the Nano-, Micro-, and Macroscale
The efforts undertaken in the structuring of nanocrystal-based network materials on different scales, fine-tuning of the individual building blocks on the nanoscale, the network connections on the microscale, and the macroscale structure and shape of the final construct are summarized. Expand
Colloidal Zn3X2 (X = P, As) quantum dots with metal salts and their transformation into (InyZn1-y)3X2via cation-exchange reactions.
  • Seungmin Baek, Jin-Soo Ha, Sungwoo Kim, Sang-Wook Kim
  • Medicine
  • Nanoscale
  • 2021
This work synthesized uniform Zn3X2 (X = P, As) quantum dots (QDs) for the first time using a stable, environmentally friendly zinc precursor instead of an organometallic precursor, and controlled the QD size from about 2.0 nm to 6.0nm. Expand
Atomically dispersed Pb ionic sites in PbCdSe quantum dot gels enhance room-temperature NO2 sensing
It is discovered that bimetallic PbCdSe quantum dot (QD) gels containing atomically dispersed Pb ionic sites achieve the optimal combination of strong sensor response and fast recovery, leading to a high-performance room-temperature p-type semiconductor NO2 sensor as characterized by a combination of ultra–low limit of detection, high sensitivity and stability, fast response and recovery. Expand


Segmented CdSe@CdS/ZnS Nanorods Synthesized via a Partial Ion Exchange Sequence
In this communication we present a synthetic pathway toward CdSe@CdS/ZnS nanorods which are built in a segment like manner (a CdSe core which is embedded in a CdS rod which then epitaxially ends in aExpand
Phase transfer of 1- and 2-dimensional Cd-based nanocrystals.
Systematic investigations have shown that the luminescence properties of the transferred nanostructures are affected by hole traps as well as by spatial insulation and passivation against the environment, and the gained knowledge could be applied to transfer for the first time 2-dimensional CdSe-CdS core-crown nanoplatelets into water while preserving significant photoluminescence. Expand
Sol-Gel assembly of CdSe nanoparticles to form porous aerogel networks.
A detailed study of CdSe aerogels prepared by oxidative aggregation of primary nanoparticles (prepared at room temperature and high temperature conditions, >250 degrees C), followed by CO2Expand
Expanding the repertoire of chalcogenide nanocrystal networks: Ag(2)Se gels and aerogels by cation exchange reactions.
Cation exchange is shown to be a simple and efficient method to prepare nanostructured Ag(2)Se gels and aerogels from CdSe gel precursors and enables exquisite control of composition on the macroscale. Expand
Selective facet reactivity during cation exchange in cadmium sulfide nanorods.
It is demonstrated that the selectivity for cation exchange to take place at different facets of the nanocrystal plays an important role in determining the resulting morphology of the binary heterostructure. Expand
Porous CdTe nanocrystal assemblies: ligation effects on the gelation process and the properties of resultant aerogels.
CdTe nanocrystal surface functionalization is found to be immaterial to oxidation induced gel formation suggesting that the standard thiolate capping procedure is not a necessary step in the gelation process. Expand
Nanoheterostructure cation exchange: anionic framework conservation.
It is demonstrated that, during an exchange of cation exchange, the anionic framework of the crystal is preserved, and this phenomenon ensures that compositional interfaces within the heterostructure are conserved throughout the transformation. Expand
Reversible gelation of II-VI nanocrystals: the nature of interparticle bonding and the origin of nanocrystal photochemical instability.
Thiolates can be employed to break up the gel network into its constituent NCs, and for the first time, the properties of the interparticle bonding in CdSe gels and aggregates are probed. Expand
CdS Aerogels as Efficient Photocatalysts for Degradation of Organic Dyes under Visible Light Irradiation.
CdS aerogel materials exhibited remarkable photocatalytic activity for dye degradation compared to typical, ligand-capped CdS NCs, and the catalytic efficiency was improved by decreasing the chain-length and extent of surface organics, leading to higher, and more hydrophilic, accessible surface area. Expand
Synthesis of Zinc and Lead Chalcogenide Core and Core/Shell Nanoplatelets Using Sequential Cation Exchange Reactions
We present the synthesis of a novel type of chalcogenide nanoplatelets. Starting from CdS core or CdSe/CdS core/shell nanoplatelets, we use sequential cation exchange to copper and then to eitherExpand