Multilayer electronic component containing graphene oxide

1 . A multilayer electronic component comprising:

a body including:

a dielectric layer, and

internal electrodes alternately disposed with the dielectric layer in a first direction;

external electrodes disposed on the body, the external electrodes including:

a first external electrode, and

a second external electrode facing the first external electrode in a second direction; and

a coating film disposed on at least a portion of an external surface of the body,

wherein:

the external surface of the body includes:

first and second surfaces facing each other in the first direction, and

third and fourth surfaces facing each other in the second direction and connected to the first and second surfaces,

at least some of the internal electrodes extend from the third surface of the body,

the coating film includes a portion that is disposed on the third surface of the body,

the portion of the coating film disposed on the third surface of the body directly contacts at least a portion of the dielectric layer, and

the coating film includes a graphene oxide layer.

2 . The multilayer electronic component of claim 1 , wherein the coating film is disposed between the body and the external electrodes.

3 . The multilayer electronic component of claim 2 , wherein:

the body includes a capacitance forming portion including the dielectric layer and the internal electrodes, and a cover portion disposed on both end surfaces of the capacitance forming portion in the first direction,

the external surface of the body further includes fifth and sixth surfaces facing each other in a third direction and connected to the first to fourth surfaces,

the dielectric layer and the internal electrodes extend from the third and fourth surfaces of the body,

the coating film is disposed to contact at least a portion of the third and fourth surfaces of the body, and

the first external electrode and the second external electrode are disposed on the third and fourth surfaces of the body, respectively.

4 . The multilayer electronic component of claim 3 , further comprising:

a side margin portion disposed on fifth and sixth surfaces of the body,

wherein the coating film is further disposed on at least a portion of both end surfaces of the side margin portion in the second direction.

5 . The multilayer electronic component of claim 1 , wherein an average thickness of the coating film is 0.345 nm or more and 30 nm or less.

6 . The multilayer electronic component of claim 1 , wherein the graphene oxide layer is 1 layer or more and 20 layers or less.

7 . The multilayer electronic component of claim 1 , wherein the graphene oxide layer includes a reduced graphene oxide layer.

8 . The multilayer electronic component of claim 1 , wherein 30%≤F/S≤100%, in which an area in which the coating film is disposed is defined as S and an area of the coating film having a thickness of 0.345 nm to 30 nm is defined as F.

9 . The multilayer electronic component of claim 1 , wherein

the external electrodes include:

a first electrode layer disposed on the body and including a first conductive metal and glass; and

a second electrode layer disposed on the first electrode layer and including a second conductive metal and a resin.

10 . A method of manufacturing the multilayer electronic component of claim 1 , the method comprising:

stacking ceramic green sheets on which internal electrode patterns are formed and performing cutting to form a stack body;

sintering the stack body;

spraying a solution including graphene oxide onto at least a portion of an external surface of the sintered stack body through a spray coating method to form a spray coating film including the graphene oxide layer;

applying an external electrode paste to the sintered stack body; and

heat-treating the external electrode paste to form the external electrodes.

11 . The method of claim 10 , wherein the spray coating film is disposed between the sintered stack body and the external electrode paste.

12 . The method of claim 11 , wherein

the stack body includes a capacitance forming portion including the ceramic green sheets and internal electrode patterns alternately disposed with one of the ceramic green sheets in the first direction and a cover green sheet disposed on both end surfaces of the capacitance forming portion in the first direction and includes first and second surfaces facing each other in the first direction, third and fourth surfaces facing each other in the second direction and connected to the first and second surfaces, and fifth and sixth surfaces facing each other in a third direction and connected to the first to fourth surfaces,

the ceramic green sheets and the internal electrode patterns extend from the third and fourth surfaces of the stack body,

the spray coating film is disposed to contact at least a portion of the third and fourth surfaces of the stack body, and

the external electrode paste is applied to the third and fourth surfaces of the stack body.

13 . The method of claim 12 , further comprising:

forming a side margin portion green sheet on fifth and sixth surfaces of the stack body, after forming the stack body,

wherein the spray coating film is further disposed on at least a portion of both end surfaces of the side margin portion green sheet in the second direction.

14 . The method of claim 10 , wherein an average thickness of the spray coating film is 0.345 nm or more and 30 nm or less.

15 . The method of claim 10 , wherein the graphene oxide layer is 1 layer or more and 20 layers or less.

16 . The method of claim 10 , wherein a concentration of the graphene oxide in the solution is 0.01 mg/mL or more and 0.50 mg/mL or less.

17 . The method of claim 10 , further comprising:

reducing the spray coating film, after forming the spray coating film, to form the coating film,

wherein the reducing of the spray coating film is performed in a reducing atmosphere with a hydrogen concentration of 1.0% to 5.0% at a temperature of 230° C. to 250° C. for 23 hours to 25 hours.

18 . The method of claim 10 , wherein

the applying of the external electrode paste includes:

applying a first electrode layer paste including a first conductive metal and glass to the sintered stack body; and

applying a second electrode layer paste including a second conductive metal and a resin to the first electrode layer paste.

19 . The method of claim 10 , wherein the heat-treating of the external electrode paste is performed in a reducing atmosphere with a hydrogen concentration of 1.0% to 5.0% at a temperature of 230° C. to 250° C. for 23 hours to 25 hours.

20 . A multilayer electronic component comprising:

a body including a dielectric layer and internal electrodes;

external electrodes disposed on the body; and

a coating film disposed on at least a portion of an external surface of the body,

wherein:

the coating film is disposed to contact at least a portion of the dielectric layer and includes a graphene oxide layer, and

30%≤F/S≤100%, in which an area in which the coating film is disposed is defined as S and an area of the coating film having a thickness of 0.345 nm to 30 nm is defined as F.

21 . A multilayer electronic component comprising:

a body including:

a dielectric layer, and

internal electrodes alternately disposed with the dielectric layer in a first direction;

external electrodes disposed on the body; and

a coating film disposed on at least a portion of an external surface of the body,

wherein:

the external surface of the body includes:

first and second surfaces facing each other in the first direction, and

third and fourth surfaces facing each other in a second direction and connected to the first and second surfaces,

at least some of the internal electrodes extend from the third surface of the body,

the coating film includes a portion that is disposed on the third surface of the body,

the portion of the coating film disposed on the third surface of the body directly contacts at least a portion of the dielectric layer,

the coating film includes a graphene oxide layer, and

an average thickness of the coating film is 0.345 nm or more and 30 nm or less.