Copper particle-free ink with enhanced performance for inkjet-printed flexible UWB antennas

Yang, Wendong; Dong, Zhichao; Guo, Zihao; Sun, Haoqiang

doi:10.1039/d3tc02515b

Cited by 4 publications

(3 citation statements)

References 44 publications

(54 reference statements)

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“…As a result, a particle-free copper ink is obtained. This complexation reaction process is basically similar to the processes reported in refs , , and .…”

Section: Resultssupporting

confidence: 85%

“…The other is made from the complex of metal copper precursor and the ligands, such as inks based on copper acetate complex, , Cuf complex, , copper(II) hydroxide complex, , and their decomposition behavior tailored by choice of coordinating ligands. Aliphatic amines, ,,− pyridine, − and alkanolamines ,,,− have been used as amine ligands to formulate such inks.…”

Section: Introductionmentioning

confidence: 99%

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Insight into the Types of Alkanolamines on the Properties of Copper(II) Formate-Based Conductive Ink

Yang,

Guo,

Zhao

et al. 2024

Langmuir

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Conductive inks are one of the most important functional materials for printed flexible electronic devices, and their properties determine the methods of subsequent patterning and metallization. In comparison with copper nanoparticle or nanowire inks, copper particlefree inks employing copper(II) formate (Cuf) as a precursor have attracted the interest of researchers due to their flexibility in preparation, excellent stability, and lower conversion temperature. Alkanolamines can provide Cuf with excellent solubility in alcohols while being less toxic and having a certain reducibility, making them preferable ligands in comparison with aliphatic amines and pyridine. However, there have been few studies on the effects of the alkanolamine types on the performance of Cuf inks. Also, the decomposition mechanism of copper−alkanolamine complex inks is not clear. In this work, different kinds of alkanolamines were chosen as ligands to formulate Cuf inks to address the mentioned issues. The influences of amine types on the stability, wettability, thermal decomposition behavior, and electrical performance of the formulated Cuf particle-free inks were investigated in detail. The results show that the utilization of alkanolamines could provide Cuf with excellent solubility in alcohols, resulting in an ink with good stability and favorable wetting properties. The thermal decomposition temperature and electrical performance of the formulated copper ink are largely dependent on the amine used. When amines with a longer carbon chain and more branches were utilized to prepare the ink, a decreased decomposition temperature was observed on the derived inks because of the steric hindrance effect. Copper films with good morphology and conductivity could be obtained at low temperatures by selecting the appropriate alkanolamine. Copper particle-free conductive ink from 2-amino-2-methyl-1-propanol demonstrated better morphology and electrical performance (16.09 μΩ•cm) and was successfully used for conductive circuits by direct-writing.

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“…As a result, a particle-free copper ink is obtained. This complexation reaction process is basically similar to the processes reported in refs , , and .…”

Section: Resultssupporting

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Insight into the Types of Alkanolamines on the Properties of Copper(II) Formate-Based Conductive Ink

Yang,

Guo,

Zhao

et al. 2024

Langmuir

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“…Lastly, inkjet printing, a low-cost, scalable, environmentally friendly approach, has up to now rarely been utilized for the fabrication of flexible UWB antennas. This method directly deposits solution-processable materials onto the specific region of the substrate 38 , which shows enormous potential in the fabrication of flexible and wearable antennas since it does not require a mask and allows designs to be modified and printed at any time 39 . In addition, it also results in high-resolution patterns and compact designs.…”

Section: Introductionmentioning

confidence: 99%

A compact tri-notched flexible UWB antenna based on an inkjet-printable and plasma-activated silver nano ink

Yang,

Zhao,

Guo

et al. 2024

Sci Rep

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The rapid development of ultrawideband (UWB) communication systems has resulted in increasing performance requirements for the antenna system. In addition to a wide bandwidth, fast propagation rates and compact dimensions, flexibility, wearability or portability are also desirable for UWB antennas, as are excellent notch characteristics. Although progress has been made in the development of flexible/wearable antennas desired notch properties are still rather limited. Moreover, most presently available flexible UWB antennas are fabricated using environmentally not attractive subtractive etching-based processes. The usage of facile additive sustainably inkjet printing processes also utilizing low temperature plasma-activated conductive inks is rarely reported. In addition, the currently used tri-notched flexible UWB antenna designs have a relatively large footprint, which poses difficulties when integrated into miniaturized and compact communication devices. In this work, a silver nano ink is used to fabricate the antenna via inkjet printing and an efficient plasma sintering procedure. For the targeted UWB applications miniaturized tri-notched flexible antenna is realized on a flexible polyethylene terephthalate (PET) substrate with a compact size of 17.6 mm × 16 mm × 0.12 mm. The antenna operates in the UWB frequency band (2.9–10.61 GHz), and can shield interferences from WiMAX (3.3–3.6 GHz), WLAN (5.150–5.825 GHz) and X-uplink (7.9–8.4 GHz) bands, as well as exhibits a certain of bendability. Three nested "C" slots of different sizes were adopted to achieve notch features. The simulation and test results demonstrate that the proposed antenna can generate signal radiation in the desired UWB frequency band while retaining the desired notch properties and having acceptable SAR values on-body, making it a viable candidate for usage in flexible or wearable communication transmission devices. The research provides a facile and highly efficient method for fabricating flexible/wearable UWB antennas, that is, the effective combination of inkjet printing processing, flexible substrates, low temperature-activated conductive ink and antenna structure design.

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A Dielectric Ink Combining Acrylate and Cyanate Moieties for Inkjet 3D Printing with Good Thermal Stability

Li,

Wu,

Yang

et al. 2024

Chin J Polym Sci

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Copper particle-free ink with enhanced performance for inkjet-printed flexible UWB antennas

Abstract: Inkjet printing, a solution-based patterning technology with high efficiency, shows enormous potential in the fabrication of antennas designed for flexible and wearable wireless communication systems. Owing to its high conductivity,...

Cited by 4 publications

References 44 publications

Insight into the Types of Alkanolamines on the Properties of Copper(II) Formate-Based Conductive Ink

Insight into the Types of Alkanolamines on the Properties of Copper(II) Formate-Based Conductive Ink

A compact tri-notched flexible UWB antenna based on an inkjet-printable and plasma-activated silver nano ink

A Dielectric Ink Combining Acrylate and Cyanate Moieties for Inkjet 3D Printing with Good Thermal Stability

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