Large area solution processed transparent conducting electrode based on highly interconnected Cu wire network

Kiruthika, S.; Gupta, Ritu; Rao, K. D. M.; Chakraborty, Swati; Padmavathy, Nagarajan; Kulkarni, Giridhar U.

doi:10.1039/c3tc32167c

Cited by 85 publications

(91 citation statements)

References 36 publications

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“…From Figures 2a and 2b, it is clear that spray coating method of forming the crack template provides a good control over the layer thickness, similar to rod coating. 26 However, the latter is not easily applicable to curved surfaces. The drop coating technique could be adapted to curved surfaces, but uniformity in coating over large area can not be assured.…”

Section: Resultsmentioning

confidence: 99%

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Spray Coating of Crack Templates for the Fabrication of Transparent Conductors and Heaters on Flat and Curved Surfaces

Gupta

Rao

Srivastava

et al. 2014

ACS Appl. Mater. Interfaces

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130

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Transparent conducting electrodes (TCEs) have been made on flat, flexible, and curved surfaces, following a crack template method in which a desired surface was uniformly spray-coated with a crackle precursor (CP) and metal (Ag) was deposited by vacuum evaporation. An acrylic resin (CP1) and a SiO2 nanoparticle-based dispersion (CP2) derived from commercial products served as CPs to produce U-shaped cracks in highly interconnected networks. The crack width and the density could be controlled by varying the spray conditions, resulting in varying template thicknesses. By depositing Ag in the crack regions of the templates, we have successfully produced Ag wire network TCEs on flat-flexible PET sheets, cylindrical glass tube, flask and lens surface with transmittance up to 86%, sheet resistance below 11 Ω/□ for electrothermal application. When used as a transparent heater by joule heating of the Ag network, AgCP1 and AgCP2 on PET showed high thermal resistance values of 515 and 409 °C cm(2)/W, respectively, with fast response (<20 s), requiring only low voltages (<5 V) to achieve uniform temperatures of ∼100 °C across large areas. Similar was the performance of the transparent heater on curved glass surfaces. Spray coating in the context of crack template is a powerful method for producing transparent heaters, which is shown for the first time in this work. AgCP1 with an invisible wire network is suited for use in proximity while AgCP2 wire network is ideal for use in large area displays viewed from a distance. Both exhibited excellent defrosting performance, even at cryogenic temperatures.

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Section: Resultsmentioning

confidence: 99%

“…In essence, we have extended a well-established method in our laboratory, 26 to curved surfaces involving spray coating. The process is highly scalable.…”

Section: ■ Conclusionmentioning

confidence: 99%

Spray Coating of Crack Templates for the Fabrication of Transparent Conductors and Heaters on Flat and Curved Surfaces

Gupta

Rao

Srivastava

et al. 2014

ACS Appl. Mater. Interfaces

Self Cite

130

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“…Large area Cu TCE by a complete solution process was realized (Figure 3d) which showed better stability than Cu nanowire based networks [72 ]. Using such TCEs, ITO-free solar cells have been demonstrated [73].…”

Section: Template Based Network Lithography Processesmentioning

confidence: 98%

“…(d) Photograph of Cu TCE/PET fabricated using electroless deposition process. Reproduced with permission from Ref[72 ] (e) IR images clearly illustrate the stability of heater while bent to different curvatures. Reproduced with permission from Ref[71 ].…”

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confidence: 98%

Towards low cost materials and methods for transparent electrodes

Kulkarni

Kiruthika

Gupta

et al. 2015

Current Opinion in Chemical Engineering

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“…While conventionally indium tin oxide (ITO)-based transparent heaters [19,20] have been in use for many years,r ecently nanomaterials such as metal nanowires, [15] CNTs [14,21,22] and graphene [16,23] are increasingly used in transparent heaters.L arge area transparent heatersh ave been demonstrated based on metal wire networks obtained using crackle lithography. [24,25] However, in the above approaches,e ither the material is expensive or the process is intensive,a nd not ideally suited to low cost disposable technology. [26] In ar ecent work, as imple method using an office laser printer has been shown to work well to produce Ag-based transparent conductors on plastic sheets with controlled fill factor,t hereby controlling the optical transmittance and the sheet resistance over wide ranges.…”

Section: Introductionmentioning

confidence: 99%

Disposable Heater Arrays Using Printed Silver Patterns on Polyethylene Terephthalate for Multipurpose Applications

Walia

Gupta

2015

Energy Tech

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Flexible, semitransparent and robust heating arrays have been designed by grayscale printing as ready‐to‐use devices for point‐of‐care application. A perforated Ag mesh is first fabricated with tunable features by controllably varying the toner grayscale value during laser printer on PET. The resistance could be varied between 1 to 2 Ω by tuning the Ag fill factor from 50 to 70 %. The Ag/PET heater based on joule heating is able to attain highly stable temperatures upto ∼135 °C maintained over long hours. Since temperature is directly related to resistance, this provides a fine temperature knob without any cumbersome processing steps. The merit of design allows individual heating elements to attain stable temperatures at low voltages (∼1.5 V) without any interference from neighboring heaters of the array, thus resulting in a thermal library. A laptop USB with 5.1 V output is able to power the thermal library for temperatures in the range of 30–60 °C, useful in many practical applications. It is a multipurpose disposable chip for in‐situ transmission microscopy that can be utilized for bioassay and point‐of‐care diagnostics, as demonstrated in the study.

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Large area solution processed transparent conducting electrode based on highly interconnected Cu wire network

Cited by 85 publications

References 36 publications

Spray Coating of Crack Templates for the Fabrication of Transparent Conductors and Heaters on Flat and Curved Surfaces

Spray Coating of Crack Templates for the Fabrication of Transparent Conductors and Heaters on Flat and Curved Surfaces

Towards low cost materials and methods for transparent electrodes

Disposable Heater Arrays Using Printed Silver Patterns on Polyethylene Terephthalate for Multipurpose Applications

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