Chiral magnetic nanocoil and synthesis methods thereof
Disclosed herein is a technique for synthesizing chiral magnetic nanocoils using an electrodeposition technique, which can be used to fabricate magnetic nanosensors capable of generating an electric field by strongly reacting to an external magnetic field, such as Faraday's law of electromagnetic induction at the nanoscale, depending on the coil shape of the nanostructure. In accordance with one embodiment, a method of synthesizing a chiral magnetic nanocoil may include generating a primary particle composed of metal ions by applying an external electric field, binding a chiral molecule to a surface of the generated primary particle, and controlling an assembly direction of a next primary particle by the bound chiral molecule.
1 . A chiral magnetic nanocoil synthesized using electroplating comprising:
a primary particle generated with metal ions by applying an external electric field; and
a chiral molecule bound to a surface of the generated primary particle, the chiral molecule having a chiral modifier of a first direction or a chiral modifier of a second direction opposite to the first direction,
wherein the chiral molecule is bound to the surface of the generated primary particle by binding cinchonine as a chiral inducer of the first direction or by binding cinchonidine as a chiral inducer of the second direction opposite to the first direction, such that the chiral magnetic nanocoil exhibits a structural directionality corresponding to the first direction or the second direction.
2 . The chiral magnetic nanocoil of claim 1 , wherein an influence of the chiral molecule is controlled by adjusting at least one of an intensity of the external electric field, a concentration of metal ion precursors and the helical modifier, or a concentration of the chiral molecule.
3 . The chiral magnetic nanocoil of claim 1 , wherein the cinchonine is bound as the chiral modifier of the first direction by binding C 19 H 22 N 2 O·½H 2 SO 4 of a concentration within a selected range as the chiral modifier of the first direction.
4 . The chiral magnetic nanocoil of claim 3 , wherein the cinchonidine is bound as the chiral modifier of the second direction by binding C 19 H 22 N 2 O of a concentration within a selected range as the chiral modifier of the second direction.
5 . The chiral magnetic nanocoil of claim 4 , wherein a concentration of the chiral modifier is designed taking into account a volume ratio of an anodic aluminum oxide (AAO) template and a concentration of the metal ions.
6 . The chiral magnetic nanocoil of claim 5 , wherein, when the AAO template is within a range of 70 to 300 nm in diameter and 10 to 100 μm in height, the chiral magnetic nanocoil is synthesized by adjusting the concentration of the metal ions and the chiral modifier in a precursor solution to a selected ratio.
7 . The chiral magnetic nanocoil of claim 5 , wherein, when the concentration of the metal ions is 50-200 mM based on the AAO template having a size of one nanopore of 200 nm in diameter and 60 μm in height, the concentration of the chiral modifier of the first direction or the second direction is designed in a range of [helical modifier]:[chiral modifier]=60-80 mM: 5-50 μM (1200-16000:1).
8 . The chiral magnetic nanocoil of claim 1 , wherein, after adding the chiral modifier of the first direction or the chiral modifier of the second direction to a solution containing a metal precursor and the helical modifier, a small amount of acid is added to adjust pH of the solution to 1.0 to 3.0, and then a nanopore template is filled and electrodeposited with the solution.
9 . A method of synthesizing the chiral magnetic nanocoil of claim 1 , the method comprising:
generating the primary particle composed of metal ions by applying an external electric field;
binding the chiral molecular to a surface of the generated primary particle; and
controlling an assembly direction of a next primary particle or an orientation of another shaping molecule by the bound chiral molecule.
10 . A nanopart comprising the chiral magnetic nanocoil of claim 1 .