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Dondapati JS, Govindhan M, Chen A. Direct growth of three-dimensional nanoflower-like structures from flat metal surfaces. Chem Commun (Camb) 2022; 58:11127-11130. [PMID: 36106462 DOI: 10.1039/d2cc04358k] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Here we report on a facile top-down approach for the direct growth of Co3O4 hierarchical nanoflowers from a bulk Co surface via chemical etching and thermal annealing. The effect of the annealing temperature was investigated, showing that amorphous Co3O4 was formed at 250 °C, while crystalline Co3O4 with notable oxygen vacancies was created at 550 °C. The formed 3D nanostructures exhibited excellent oxygen evolution reaction (OER) activities with a low overpotential of 0.34 V at 10 mA cm-2 and high durability. The proposed novel approach was further demonstrated by the direct growth of 3D NiO and CuO nanostructures on Ni and Cu substrates.
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Affiliation(s)
- Jesse S Dondapati
- Electrochemical Technology Centre, Department of Chemistry, University of Guelph, Guelph, ON-N1G 2W1, Canada.
| | - Maduraiveeran Govindhan
- Department of Chemistry, SRM Institute of Science and Technology, Kattankulathur, 603 203, Tamil Nadu, India
| | - Aicheng Chen
- Electrochemical Technology Centre, Department of Chemistry, University of Guelph, Guelph, ON-N1G 2W1, Canada.
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Truong TA, Nguyen TK, Zhao H, Nguyen NK, Dinh T, Park Y, Nguyen T, Yamauchi Y, Nguyen NT, Phan HP. Engineering Stress in Thin Films: An Innovative Pathway Toward 3D Micro and Nanosystems. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2022; 18:e2105748. [PMID: 34874620 DOI: 10.1002/smll.202105748] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/20/2021] [Revised: 10/23/2021] [Indexed: 06/13/2023]
Abstract
Transformation of conventional 2D platforms into unusual 3D configurations provides exciting opportunities for sensors, electronics, optical devices, and biological systems. Engineering material properties or controlling and modulating stresses in thin films to pop-up 3D structures out of standard planar surfaces has been a highly active research topic over the last decade. Implementation of 3D micro and nanoarchitectures enables unprecedented functionalities including multiplexed, monolithic mechanical sensors, vertical integration of electronics components, and recording of neuron activities in 3D organoids. This paper provides an overview on stress engineering approaches to developing 3D functional microsystems. The paper systematically presents the origin of stresses generated in thin films and methods to transform a 2D design into an out-of-plane configuration. Different types of 3D micro and nanostructures, along with their applications in several areas are discussed. The paper concludes with current technical challenges and potential approaches and applications of this fast-growing research direction.
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Affiliation(s)
- Thanh-An Truong
- Queensland Micro and Nanotechnology Centre, Griffith University, Nathan, Queensland, 4111, Australia
| | - Tuan-Khoa Nguyen
- Queensland Micro and Nanotechnology Centre, Griffith University, Nathan, Queensland, 4111, Australia
| | - Hangbo Zhao
- Department of Aerospace and Mechanical Engineering, University of Southern California, Los Angeles, CA, 90089, USA
| | - Nhat-Khuong Nguyen
- Queensland Micro and Nanotechnology Centre, Griffith University, Nathan, Queensland, 4111, Australia
| | - Toan Dinh
- Centre for Future Materials, University of Southern Queensland, Ipswich, Queensland, 4305, Australia
| | - Yoonseok Park
- Querrey Simpson Institute for Bioelectronics, Northwestern University, Evanston, IL, 60208, USA
| | - Thanh Nguyen
- Centre for Future Materials, University of Southern Queensland, Ipswich, Queensland, 4305, Australia
| | - Yusuke Yamauchi
- Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Brisbane, Queensland, 4072, Australia
| | - Nam-Trung Nguyen
- Queensland Micro and Nanotechnology Centre, Griffith University, Nathan, Queensland, 4111, Australia
| | - Hoang-Phuong Phan
- Queensland Micro and Nanotechnology Centre, Griffith University, Nathan, Queensland, 4111, Australia
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