US 2012/0258308 A1 · Single-crystal apatite nanowires sheathed in graphitic shells and synthesis method thereof

Abstract

Heterogeneous nanowires having a core-shell structure consisting of single-crystal apatite as the core and graphitic layers as the shell and a synthesis method thereof are provided. More specifically, provided is a method capable of producing large amounts of heterogeneous nanowires, composed of graphitic shells and apatite cores, in a reproducible manner, by preparing a substrate including an element corresponding to X of X6(YO4)3Z which is a chemical formula for apatite, adding to the substrate a gaseous source containing an element corresponding to Y of the chemical formula, adding thereto a gaseous carbon source, and allowing these reactants to react under optimized synthesis conditions using chemical vapor deposition (CVD), and to a method capable of freely controlling the structure and size of the heterogeneous nanowires and also to heterogeneous nanowires synthesized thereby.

Claims15

Dependent claims

A method for synthesizing single-crystal apatite nanowires sheathed in graphitic shells, the method comprising

i) introducing into a reactor either a material including an element corresponding to X of X5(YO4)3(Z), which is a chemical formula for apatite, or a substrate containing the material;
ii) maintaining the inside of the reactor in a vacuum and supplying a carrier gas to the reactor;
iii) increasing the temperature of the reactor to synthesis temperature;
iv) supplying reactant gases comprising carbon and phosphorus sources to the reactor and allowing the reactant gases to react with the material or substrate introduced into the reactor in step i);
and
v) cooling the reactor to room temperature in a carrier gas atmosphere.

3 more elements

A method for synthesizing single-crystal apatite nanowires sheathed in graphitic shells, which have a lateral change along the axial direction thereof, the method comprising the steps of:

i) introducing into a reactor either a material including an element corresponding to X of X5(YO4)3(Z), which is a chemical formula for apatite, or a substrate containing the material;
ii) maintaining the inside of the reactor in a vacuum and supplying a carrier gas to the reactor;
iii) increasing the temperature of the reactor to synthesis temperature;
iv) supplying reactant gases comprising carbon and phosphorus sources into the reactor and allowing the reactant gases to react with the material or substrate, introduced into the reactor in step i);
v) controlling any one or more of the temperature of the reaction between the reactant gases and the substrate, the reaction time, and the concentration of the carbon or phosphorus-containing reactant gases, thereby controlling the shape of the heterogeneous nanowires being synthesized;
and
vi) cooling the reactor to room temperature in a carrier gas atmosphere.

4 more elements

Dependencies are inferred from the claim text.

Single-crystal apatite nanowires sheathed in graphitic shells and synthesis method thereof

Life of this patent

Single-crystal apatite nanowires sheathed in graphitic shells and synthesis method thereof

Life of this patent

Abstract

Claims15