Surface diffusion driven nanoshell formation by controlled sintering of mesoporous nanoparticle aggregates.
نویسندگان
چکیده
We report a general method for the synthesis of hollow structures of a variety of functional inorganics by partial sintering of mesoporous nanocrystal aggregates. The formation of a thin shell initiates the transport of mass from the interior leading to growth of the shell. The principles are general and the hollow structures thus produced are attractive for many applications including catalysis, drug delivery and biosensing.
منابع مشابه
Multiparticle sintering dynamics: from fractal-like aggregates to compact structures.
Multiparticle sintering is encountered in almost all high temperature processes for material synthesis (titania, silica, and nickel) and energy generation (e.g., fly ash formation) resulting in aggregates of primary particles (hard- or sinter-bonded agglomerates). This mechanism of particle growth is investigated quantitatively by mass and energy balances during viscous sintering of amorphous a...
متن کاملSurface-enhanced Raman scattering on tunable plasmonic nanoparticle substrates.
Au and Ag nanoshells are investigated as substrates for surface-enhanced Raman scattering (SERS). We find that SERS enhancements on nanoshell films are dramatically different from those observed on colloidal aggregates, specifically that the Raman enhancement follows the plasmon resonance of the individual nanoparticles. Comparative finite difference time domain calculations of fields at the su...
متن کاملDNA-Controlled Assembly of Protein-Modified Gold Nanocrystals
The controlled assembly in solution of gold nanocrystals modified by attachment of complementary proteinDNA conjugates is described. The size of the aggregates formed can be controlled by the addition of singlestranded DNA, which quickly terminates the assembly process. The rate of formation of the aggregates can also be controlled by varying the salt concentration. Consequently, two distinct r...
متن کاملKinetic Monte-Carlo simulations of sintering
We simulate the sintering of particle aggregates due to surface diffusion. As a method we use Kinetic Monte-Carlo simulations in which elasticity can explicitly be taken into account. Therefore it is possible to investigate the shape relaxation of aggregates also under the influence of an external pressure. Without elasticity we investigate the relaxation time and surface evolution of sintering...
متن کاملA spatially resolved study on the Sn diffusion during the sintering process in the active layer of dye sensitised solar cells.
Dye sensitised solar cells (DSSCs) use a mesoporous TiO(2) scaffold, typically assisted by an adsorbed dye, as the main active element, responsible for the photon absorption, exciton generation and charge separation functionality. The sintering process employed in the TiO(2) active layer fabrication plays a crucial role in the formation of the nanoparticle scaffold and hence the performance of ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید
ثبت ناماگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید
ورودعنوان ژورنال:
- Nanoscale
دوره 2 8 شماره
صفحات -
تاریخ انتشار 2010