Controlling the Diameter of Cu₂O Nanowires by Electrodeposition

Lee, Jaeyoung,Oh, Jaeho,Tak, Yongsug 한국공업화학회 2004 Journal of Industrial and Engineering Chemistry Vol.10 No.6

Cuprous oxide (Cu₂O) nanowires were prepared by electrodeposition into a porous alumina template. To deposit the Cu₂O nanowires defect-free into the alumina membrane, a cathodic current density of -0.5 ㎃/㎠ was constantly applied in a copper sulfate electrolyte in the presence of lactic acid. Top-view and cross-sectional observations by TEM and SEM showed homogeneous filling of the Cu₂O nanowires in the 100- and 200-㎚ alumina pores. The length of the Cu₂O nanowires was 4 ㎛. EDS data indicated pure Cu₂O and XRD analysis showed preferential growth of Cu₂O (200) and (111) nanowires in the absence of Cu metal and CuO.

미세구조가 제어된 전해도금 Cu₂O 광양극의 광전기화학 특성

정다솔(Dasol Jeong),조우현(Woohyeon Jo),정재범(Jaebum Jeong),정현성(Hyunsung Jung) 한국표면공학회 2020 한국표면공학회지 Vol.53 No.5

Cu₂O films as a photocathode for photoelectrochemical water splitting were potentiostatically deposited on FTO glasses. The morphology and composition of the electrodeposited Cu₂O films were adjusted by the applied potentials. The potential-dependent grain size of Cu₂O films was characterized by XRD and SEM analysis. Photoelectrochemical properties of the fabricated Cu₂O photocathodes were investigated with photocurrents as a function of potentials under 1 sun condition of 100mW/cm². Photocurrents of the electrodeposited Cu₂O films were controlled with the tailored surface morphologies of Cu₂O photocathodes.

Size-Controlled Cu2O Nanocubes by Pulse Electrodeposition

송유정,박경원,한상범,Hyun-Hwi Lee 한국전기화학회 2010 한국전기화학회지 Vol.13 No.1

In this work, highly uniform size-controlled Cu2O nanocubes can be successfully formed by means of pulse electrodeposition. The size distribution, crystal structure, and chemical state of deposited Cu2O nanocubes are characterized using scanning electron microscopy, transmission electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy. The phase transition from Cu2O to Cu can be controlled by constant current electrodeposition as a function of deposition time. In particular, the size of the Cu2O nanocubes can be controlled using pulse electrodeposition as a function of applied current density.

Growth and characterization of p-Cu₂O/n-ZnO nanorod heterojunctions prepared by a two-step potentiostatic method

Jeong, Y.S.,Kim, H.,Lee, H.S. Elsevier Sequoia 2013 Journal of alloys and compounds Vol.573 No.-

p-Cu<SUB>2</SUB>O/n-ZnO nanorod heterojunctions were fabricated by a two-step process. The process was performed with potentiostatic deposition of n-ZnO nanorods on conductive indium-tin-oxide (ITO) glasses followed by potentiostatic deposition of p-Cu<SUB>2</SUB>O to form p-Cu<SUB>2</SUB>O/n-ZnO nanorod heterojunctions. The deposition condition required to form the cuprous oxide layer affected significantly the formation and microstructure of the p-Cu<SUB>2</SUB>O/n-ZnO nanorod heterojunctions. In particular, the high-quality p-Cu<SUB>2</SUB>O/n-ZnO nanorod heterojunctions were obtained only at relatively high temperatures of 90 and 100<SUP>o</SUP>C. The p-Cu<SUB>2</SUB>O/n-ZnO nanorod heterojunctions exhibited a well-defined p-n diode characteristic with an ideality factor of about 4.3.

Size-Controlled Cu₂O Nanocubes by Pulse Electrodeposition

Song, You-Jung,Han, Sang-Beom,Lee, Hyun-Hwi,Park, Kyung-Won The Korean Electrochemical Society 2010 한국전기화학회지 Vol.13 No.1

In this work, highly uniform size-controlled $Cu_2O$ nanocubes can be successfully formed by means of pulse electrodeposition. The size distribution, crystal structure, and chemical state of deposited $Cu_2O$ nanocubes are characterized using scanning electron microscopy, transmission electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy. The phase transition from $Cu_2O$ to Cu can be controlled by constant current electrodeposition as a function of deposition time. In particular, the size of the $Cu_2O$ nanocubes can be controlled using pulse electrodeposition as a function of applied current density.

전착법을 이용한 Cu2O 박막 형성 및 공정 조건에 따른 특성 변화

조재유,하준석,류상완,허재영 한국마이크로전자및패키징학회 2017 마이크로전자 및 패키징학회지 Vol.24 No.2

Cuprous oxide (Cu2O) is one of the potential candidates as an absorber layer in ultra-low-cost solar cells. Cu2O is highly desirable semiconducting oxide material for use in solar energy conversion due to its direct band gap (Eg = ~2.1 eV) and high absorption coefficient that absorbs visible light of wavelength up to 650 nm. In addition, Cu2O has other several advantages such as non-toxicity, low cost and also can be prepared with simple and cheap methods on large scale. In this work, we deposited the Cu2O thin films by electrodeposition on gold coated SiO2/Si wafers. We changed the process conditions such as pH of the solution, applied potential on working electrode, and solution temperature. Finally, we confirmed the structural properties of the thin films by XRD and SEM. Cu2O는 초저가 태양전지의 흡수층으로 적용될 수 있는 물질 중 하나로 direct band gap(Eg= ~2.1 eV)을 갖고있으며 최대 650 nm 파장의 빛을 흡수 할 수 있는 높은 흡수율을 가지고 있다. 또한 무독성, 풍부한 매장량으로 낮은 비용 등의 여러 장점을 가지며 간단하고 저렴한 방법으로 대량으로 제작이 가능하다. 본 연구에서 Au가 증착된 SiO2/Si 기판 위에 전착법을 통해 Cu2O 박막을 제작하였다. 우리는 용액의 pH와 작업전극에 인가되는 전위, 용액의 온도와 같은 공정조건을 바꾸어주었고 최종적으로 XRD와 SEM 사진 분석을 통해 박막의 특성을 확인하였다.

Fast and selective Cu2O nanorod growth into anodic alumina templates via electrodeposition

주형국,이재광,이종민,이재영 한국물리학회 2012 Current Applied Physics Vol.12 No.1

The fast and selective growth of cuprous oxide (Cu2O) nanorods into anodic aluminum oxide (AAO)templates is achieved under optimized alkaline conditions via electrochemical deposition. The growth rate of Cu2O nanorods at room temperature reached 360 nm/min, the fastest rate reported to date. The synthesis of Cu2O nanorods by applying a constant current by using Cu2O nanotubes as a transition state is extensively discussed; a Pt pottery-shaped layer played a key role as a seed layer for the fast Cu2O growth. We report here the existence of regions of nanostructured Cu2O based on our studies and previous relevant works, which include potential-pH curves for Cu2+-lactate solutions.

Fast and selective Cu₂O nanorod growth into anodic alumina templates via electrodeposition

Ju, H.,Lee, J.K.,Lee, J.,Lee, J. Elsevier 2012 Current Applied Physics Vol.12 No.1

The fast and selective growth of cuprous oxide (Cu<SUB>2</SUB>O) nanorods into anodic aluminum oxide (AAO) templates is achieved under optimized alkaline conditions via electrochemical deposition. The growth rate of Cu<SUB>2</SUB>O nanorods at room temperature reached 360 nm/min, the fastest rate reported to date. The synthesis of Cu<SUB>2</SUB>O nanorods by applying a constant current by using Cu<SUB>2</SUB>O nanotubes as a transition state is extensively discussed; a Pt pottery-shaped layer played a key role as a seed layer for the fast Cu<SUB>2</SUB>O growth. We report here the existence of regions of nanostructured Cu<SUB>2</SUB>O based on our studies and previous relevant works, which include potential-pH curves for Cu<SUP>2+</SUP>-lactate solutions.

Facile fabrication of n-ZnO nanorods/p-Cu₂O heterojunction and its photodiode property

Kathalingam, A.,Vikraman, Dhanasekaran,Kim, Hyun-Seok,Park, Hui Joon North-Holland 2017 Optical materials Vol.66 No.-

<P><B>Abstract</B></P> <P>This report presents the fabrication and characterization of n-ZnO nanorods/p-Cu<SUB>2</SUB>O hetrojunction photo-diode. The ZnO nanorods (NRs) were deposited onto electrodeposited Cu<SUB>2</SUB>O thin film by hydrothermal method. The structural, morphological and optical properties of ZnO NRs and Cu<SUB>2</SUB>O films were studied by X-ray diffraction, scanning electronic microscopy, UV–Vis spectrophotometer, respectively. XRD patterns revealed that the as-grown films were highly crystalline nature with strong predominant orientation of (111) and (002) lattices corresponding to Cu<SUB>2</SUB>O and ZnO NRs, respectively. Current–voltage (I–V) characteristic of n-ZnONRs/p-Cu<SUB>2</SUB>O structure confirmed the formation of heterojunction exhibiting diode-like rectifying nature. It showed enhanced conversion of UV light, which indicates the suitability of the simple and low-cost n-ZnO NRs/p-Cu<SUB>2</SUB>O heterojunction device for optoelectronic applications. The sandwich type ITO/n-ZnO NRs/p-Cu<SUB>2</SUB>O/ITO structure is quite novel approach for the efficient and complete collection of carriers in nanorods incorporated devices.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Successfully fabricated ZnO NRs/Cu<SUB>2</SUB>O heterojunction by facile solution routes. </LI> <LI> Shown good photodiode response. </LI> <LI> Showed excellent UV light response suitable for UV light sensor. </LI> <LI> Sandwich type device using ITO as a transparent conductor is a novel approach for Nanorods structure. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Formation of Microstructure by Copper-Cuprous Co- Electrodeposition Using Stirring and Boric Acid Addition

이재민,고종수 한국정밀공학회 2017 International Journal of Precision Engineering and Vol.18 No.6

This paper reports the effects of the stirring rate of the solution, boric acid concentration, and applied current density on the formation of the copper-cuprous co-electrodeposited structure. For copper-cuprous co-electrodeposition, 0.5 M CuSO4·5H2O solution was used. When electrodeposition was performed via stirring and the addition of boric acid, pillar-type electrodeposited structures were formed. On the other hand, when electrodeposition was carried out without stirring or the addition of boric acid, hill-type electrodeposited structures were formed. Development of the pillar structure was promoted by increasing the boric acid concentration and the stirring rate. The electrodeposited structure was applied to surface modification in order to verify its industrial effectiveness. When the concentration of the added boric acid was higher than 0.5 M and the stirring rate of the solution was 200 rpm, the fabricated specimens showed superhydrophobic properties after hydrophobic layer coating.