Article
Materials Science, Multidisciplinary
O. Tolga Gul
Summary: A simple and cost effective method was developed to grow a 2.6 mm long vertically aligned carbon nanotube (VACNT) forest without using etchants or other complicated systems. By reducing the catalyst at lower temperature and using low carbon feedstock, dense and uniform nanoparticles formation was achieved, extending the catalyst NP lifetime. Additionally, the time varying forest height of VACNT was accurately represented by the Gompertz model due to low temperature catalyst reduction, enabling a cost effective and eco-friendly synthesis.
DIAMOND AND RELATED MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
Fahd M. Rajab
Summary: Vertically aligned carbon nanotubes (VACNT) are promising soft materials for advanced devices, such as wearable strain sensors. This study investigates the growth behavior and morphology of VACNT using chemical vapor deposition (CVD) under controlled process conditions, and identifies optimized values for key parameters.
Article
Engineering, Electrical & Electronic
Donglai Zhong, Jingxia Liu, Mengmeng Xiao, Yunong Xie, Huiwen Shi, Lijun Liu, Chenyi Zhao, Li Ding, Lian-Mao Peng, Zhiyong Zhang
Summary: This study demonstrates the fabrication of identical PUFs (twin PUFs) on a carbon nanotube array for secure communication. Two rows of field-effect transistors fabricated perpendicular to the growth direction of carbon nanotubes randomly produce three types of transistor channels, which can be used to extract ternary bits as a shared key. The twin PUFs exhibit high uniformity, uniqueness, randomness, and reliability, with approximately 95% consistency. Furthermore, separated twin PUFs can achieve secure communication with a bit error rate of one bit per trillion via fault-tolerant design.
NATURE ELECTRONICS
(2022)
Article
Chemistry, Multidisciplinary
Emily Schifano, Gianluca Cavoto, Francesco Pandolfi, Giorgio Pettinari, Alice Apponi, Alessandro Ruocco, Daniela Uccelletti, Ilaria Rago
Summary: The emergence of multidrug-resistant bacteria is a growing threat to public health, necessitating the development of non-antibiotic antibacterial approaches. In this study, vertically aligned carbon nanotubes (VA-CNTs) with controlled nanomorphology were proposed as effective platforms for bacteria eradication. Through a combination of microscopic and spectroscopic techniques, the topography of VA-CNTs was tailored in a controlled and time-efficient manner using plasma etching processes. The highest reduction in cell viability was observed for VA-CNTs modified using plasma etching with Ar and O-2, indicating their potential as a surface for inactivating both planktonic and biofilm infections.
Article
Chemistry, Multidisciplinary
R. M. Silva, J. Rocha, R. F. Silva
Summary: In this study, we successfully coated vertically aligned carbon nanotube micropillars with a uniform and high surface area Fe-NH2TP hybrid coating using Atomic/Molecular Layer Deposition (ALD/MLD). The effectiveness of the coating was confirmed through various analytical techniques. The hydrophobic property of the Fe-NH2TP hybrid film was also demonstrated. These findings contribute to advancing the understanding of growing high-quality one-dimensional materials using ALD/MLD and have potential for future research in this field.
Article
Materials Science, Multidisciplinary
Yongjun Kim, P. R. Deshmukh, Weon Gyu Shin
Summary: Vertically aligned ZnO nanowires developed on Pt coated Si-wafer exhibit high photocurrent density and water splitting efficiency under light illumination, making them promising photoelectrodes for solar energy applications.
Article
Chemistry, Multidisciplinary
Qingwei Yan, Fakhr E. Alam, Jingyao Gao, Wen Dai, Xue Tan, Le Lv, Junjie Wang, Huan Zhang, Ding Chen, Kazuhito Nishimura, Liping Wang, Jinhong Yu, Jibao Lu, Rong Sun, Rong Xiang, Shigeo Maruyama, Hang Zhang, Sudong Wu, Nan Jiang, Cheng-Te Lin
Summary: In this study, a 120 mu m-thick freestanding film composed of vertically aligned, covalently bonded graphene nanowalls (GNWs) was grown by mesoplasma chemical vapor deposition. With silicone filling, the fabricated adhesive TIMs showed a high through-plane thermal conductivity of 20.4 W m(-1) K-1 at a low graphene loading of 5.6 wt%, achieving cooling efficiency approximately 1.5 times higher than commercial TIMs. The TIMs strike a balance between high thermal conductivity and small bond line thickness, providing superior cooling performance for high-power LED chips.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Chemistry, Physical
Guangjie Yuan, Zhenhua Liu, Zhipeng Cao, Jiefei Xie, Haohao Li, Long Li, Yueli Sun, Yingzhong Tian
Summary: This study utilized PECVD to prepare VACNTs on ALD ZnO films, with NH2 radicals exhibiting higher reactivity than H2 molecules and H radicals, leading to lower activation energy for the nucleation and initial growth of VACNTs.
CHEMICAL PHYSICS LETTERS
(2021)
Review
Chemistry, Multidisciplinary
Blagoj Karakashov, Martine Mayne-L'Hermite, Mathieu Pinault
Summary: Vertically aligned carbon nanotubes (VACNT) are manufactured nanomaterials with excellent properties and great potential. Research on VACNT synthesis has focused on different planar and non-planar substrates, with adjustments made according to the desired application. Previous studies have shown that the commonly used insulating diffusion barrier layers (DBLs) limit the conducting and other physico-chemical properties of the final nanomaterial composite. To address this, researchers have proposed the use of semiconducting/conducting interlayers to improve the contact resistance and composite properties. This review summarizes different methods and techniques for the deposition of suitable conducting interfaces and controlled growth of VACNT on various substrates, emphasizing the importance of a conducting interface in the synthesis of cost-effective and high-performance nano-engineered carbon composites on carbonaceous substrates.
Article
Chemistry, Physical
Kai Zhang, Wenbin Gong, Zhuo Li, Weigao Xu, Yagang Yao
Summary: By adding a layer of patterned aluminum to the conventional catalyst, the orientation, density, and arrangement of nanotube segments in CNT forests were improved, resulting in a CNTF with densely-packed, horizontally-aligned surface nanotube segments. Nanoindentation results and coarse-grained simulations indicated that the lateral stretching of nanotube segments played a major role in the superior adhesion performance of the CNTF.
Article
Materials Science, Ceramics
Xianghui Zeng, Hui Chen, Jinfeng Wu, Wei Fang, Xing Du, Xuan He, Daheng Wang, Weixin Li, Lei Zhao
Summary: In this study, vertically aligned BNNSs were synthesized without any substrates using Fe-catalyzed thermal chemical vapor deposition method. The BNNSs exhibited improved crystallinity, high UV light emission, and excellent anti-oxidation behavior due to their unique structures. This environmentally friendly synthesis method allows for exploration of industrial upscaling applications.
CERAMICS INTERNATIONAL
(2022)
Article
Nanoscience & Nanotechnology
Yong Lei, Xiaozhan Yang, Wenlin Feng
Summary: Van der Waals heterostructures based on 2D transition metal dichalcogenides and conventional semiconductors have been used in this work to synthesize vertically-aligned MoS2 nanofilm and fabricate self-powered broadband photodetectors. The devices demonstrate superior photoelectric performances and fast response speed, indicating their potential applications in the deep ultraviolet-near infrared detection field.
Article
Physics, Multidisciplinary
Umang Sharma, Suresh C. Sharma
Summary: This theoretical study models a vertically aligned carbon nanotube (VACNT) array in plasma and investigates the influence of plasma operating conditions and process parameters on the array's characteristics. The study shows that the length and average diameter of the VACNT array can be optimized by adjusting the operating conditions and glow discharge parameters, and the influence of array aspects on field emission properties is observed.
EUROPEAN PHYSICAL JOURNAL PLUS
(2022)
Article
Chemistry, Physical
Emeline Charon, Mathieu Pinault, Martine Mayne-L'Hermite, Cecile Reynaud
Summary: The one-step aerosol-assisted catalytic chemical vapor deposition (CCVD) process, operated in a H-2-based carrier gas, can efficiently prepare forests of vertically aligned multiwalled carbon nanotubes (VACNTs) with high purity and good crystalline level at extremely low ferrocene content. The iron content in the VACNT sample is proportional to the ferrocene concentration in the precursor, while reducing the ferrocene concentration leads to a decrease in VACNT number density and an increase in growth rate with similar CNT diameters and crystalline structure, indicating high oxidation resistance.
Article
Chemistry, Physical
Yasar Ozkan Yesilbag, Fatma Nur Tuzluca Yesilbag, Ahmad Huseyin, Ahmed Jalal Salih Salih, Mehmet Ertugrul
Summary: In this study, nitrogen-doped vertically aligned carbon nanotubes (N-VACNTs) were synthesized and combined with MnO2 nanosheets to form a nano-composite structure. This structure exhibited high electrical conductivity, fast ion transfer, and excellent performance and stability in charge-discharge cycles and practical applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
