Sintering of Ultrathin Gold Nanowires for Transparent Electronics

Maurer, Johannes H. M.; González‐García, Lola; Reiser, Beate; Kanelidis, Ioannis; Kraus, Tobias

doi:10.1021/acsami.5b02088

Cited by 61 publications

(83 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Self‐organized wires are not electrically conductive, because the organic OAm shell that is required in AuNW synthesis and aids self‐organization constitutes a tunnel barrier for electrons. A “soft” plasma sintering step in a hydrogen/argon plasma removed the insulating ligand shell and coarsened the structure to improve stability . The sintering step was performed at room temperature and is compatible to a variety of substrates.…”

Section: Resultsmentioning

confidence: 99%

“…The sintering step was performed at room temperature and is compatible to a variety of substrates. We followed the structural effects of plasma sintering in the GISAXS patterns: single‐wire peaks disappeared as the wires sintered into larger superstructures revealing the complete sintering of the wire bundles (see Figure S2, Supporting Information) …”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Direct Nanoimprinting of a Colloidal Self‐Organizing Nanowire Ink for Flexible, Transparent Electrodes

Maurer

González‐García

Backes

et al. 2017

Adv Materials Technologies

Self Cite

View full text Add to dashboard Cite

A semicontinuous process is used to nanoimprint a nanowire ink and form transparent conductive electrodes. Ultrathin gold nanowires are confined in the features of an elastomeric stamp, where they spontaneously assemble upon drying into hierarchical, percolating superstructures. This templated self‐organization yields grids with defined line widths down to 0.9 µm and high pattern fidelity. Metal grids with square, hexagonal, and linear features are printed over 30 cm2 on different substrates and gently sintered in hydrogen plasma. Meshes on polyethylene terephthalate foil show high optical transmittances (>92%) and low sheet resistances (106–168 Ω sq−1). Their resistance is changed by only 10% after 500 bending cycles at a radius of 5 mm. The printed electrodes are used to build capacitive and resistive touch sensor devices.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Direct Nanoimprinting of a Colloidal Self‐Organizing Nanowire Ink for Flexible, Transparent Electrodes

Maurer

González‐García

Backes

et al. 2017

Adv Materials Technologies

Self Cite

View full text Add to dashboard Cite

show abstract

“…The fi gure of merit of AuNWs mesh electrode gave σ d c /σ o p = 30 ( Figure S13, Supporting Information), which is 24 times larger than AuNWs nanomembrane previously reported. [ 18 ] Comparing the performance with other AuNWs [ 18,35,[39][40][41] ( Figure S14, Supporting Information), our method stands as advantageous strategy for the fabrication of conductive and transparent fi lms. The improved conductivity may be due to the merit of mesh geometry, which provided greater thickness of the bundles relative to nanowire membranes, and the larger holes that will increase the transmittance at a given sheet resistance due to the larger amount of metal stacked out of the plane of the fi lm.…”

Section: Electrical and Optical Characterizationmentioning

confidence: 99%

“…This was followed by argon plasma of 20 min, which could further reduce junction resistance (see Figure S11, Supporting Information for the studies of optimum plasma treatment time), similar to the recent reports. [ 39 ] By fi xing 20 °C aging temperatures, the relationship of sheet resistance and optical transmittance was systematically investigated with different aging time (Figure 3 c). This was done by preparation of multilayered mesh fi lm followed by measurements of electrical conductivities and optical transparencies for each fi lm thickness ( Figure S12, Supporting Information).…”

Section: Electrical and Optical Characterizationmentioning

confidence: 99%

Fabrication of Highly Transparent and Flexible NanoMesh Electrode via Self‐assembly of Ultrathin Gold Nanowires

Gong

Zhao

Yap

et al. 2016

Adv Elect Materials

119

120

View full text Add to dashboard Cite

new design principles. Nanomaterials, such as carbon nanotubes, [1,3,4,[12][13][14] graphene, [15,16] and metal nanowires [8,9,[17][18][19][20][21][22][23][24] have been recently explored and demonstrated their potentials to flexible TE overcoming shortcoming of current ITObased TE (brittleness, low inferred transmittance, and earth rareness). Despite this potential, it remains challenging to achieve high conductivity and high transparency without deterioration under repeated bending and stretching cycles. In this context, metal mesh/grid is emerging as a promising solution, which achieved exceptionally low-sheet resistance and high optical transparency. [25][26][27] The fabrication of mesh-like electrodes could be achieved by top-down [25][26][27][28] and bottomup [29,30] approaches. Self-assembled meshlike structure have been successfully demonstrated by using silver and gold nanoparticles. [29,30] However, to the best of our knowledge, self-assembled mesh geometry based on 1D nanowire materials has not been reported. Here, we report a simple yet efficient solution-based, equipment-free interfacial self-assembly strategy to fabricate mesh TE (mTE) using ultrathin gold nanowires. Unlike other metal nanomaterials, ultrathin gold nanowires we used possess a serpentine morphology due to its ultrathin width (≈2 nm) and ultrahigh aspect ratio (>10 000). [31][32][33] Briefly, freshly synthesized AuNWs hexane solutions were purified and aged prior to spreading onto air-water interface. During the hexane evaporation, AuNWs could self-assemble into bundles with a mesh-like network. The partial removal of oleyamine ligands during aging may be the reason for the bundle formation. [34] The bundles had a typical thickness of 193.7 ± 67.6 nm and mesh pore sizes varied from 8 μm to 52 μm, depending on 100 random pores at aging time of 12 h. The resulting mesh film is easily transferred to a variety of substrate, exhibiting a sheet resistance of ≈40 times smaller than our previous nonmeshed film [18] under the similar optical transmittance of ≈92%. Moreover, our mesh electrode is patternable and washable with excellent flexibility, which could be directly used for touch screen and flexible circuit of light emitting devices (LEDs). We believe our approach opens a new route to flexible TE for applications in future soft electronic sensors, displays and energy-harvesting devices.Transparent electrodes simultaneously require high electrical conductivity and high optical transparency, which have been achieved with mesh metal structures. However, most currently fabricated micro-and nanoelectronic devices are produced via top-down lithography methods. Here, a bottomup self-assembly approach to fabricate mesh electrode using ultrathin gold nanowires (AuNWs) at the air/water interface is reported. Slow partial ligand removal during the aging process is the key for the formation of such self-assembled mesh structures. The resulting mesh film has a typical mesh pore size of 8-52 μm, with a sheet resistance of ≈40 times smaller than our pr...

show abstract

“…Among various ultrathin nanowires, noble‐metal nanowires have been investigated intensively because of their high aspect ratios and promising applications in nanoscale electronics and catalysis . To date, various synthetic routes that include templating, ligand control, and oriented attachment have been developed for the preparation of ultrathin nanowire materials with well‐defined morphologies . Among these, an oleylamine‐based system has been demonstrated to be an effective preparation route for single‐component noble‐metal nanowires, such as Au, Ag, Pt, and Pd .…”

Section: Introductionmentioning

confidence: 99%

General Synthetic Protocol for the Synthesis of Ru‐X (X=Rh, Pd, Ag) Heterogeneous Ultrathin Nanowires with a Tunable Composition

Sun

et al. 2016

ChemCatChem

View full text Add to dashboard Cite

Herein, a wet‐chemical strategy was devised for the preparation of ultrathin Ru‐based (Ru‐Pd, Ru‐Ag, and Ru‐Rh) heterogeneous nanowires without the use of templates and organic solvents. The success of this synthetic strategy relies on the combination of heterogeneous nucleation and oriented attachment processes. In the synthesis, polyvinylpyrrolidone (PVP) and sodium iodide play very important roles in the growth of the ultrathin nanowires. PVP induces the linear attachment of Ru‐based nanostructures, and I− ions effectively tune the reaction kinetics of the reduction of the metal ions through the formation of more stable compounds. The average diameter of the Ru‐based nanowires is only 3 nm, approximately 12 atoms thick. Importantly, the components of the ultrathin nanowires can be tuned easily by changing the types of precursors and concentrations. As a result of the ultrathin structure and heterojunctions, the as‐synthesized Ru‐based ultrathin nanowires exhibit a good catalytic activity in the Suzuki–Miyaura reaction with a low loss of catalytic activity after several reuses.

show abstract

Sintering of Ultrathin Gold Nanowires for Transparent Electronics

Cited by 61 publications

References 34 publications

Direct Nanoimprinting of a Colloidal Self‐Organizing Nanowire Ink for Flexible, Transparent Electrodes

Direct Nanoimprinting of a Colloidal Self‐Organizing Nanowire Ink for Flexible, Transparent Electrodes

Fabrication of Highly Transparent and Flexible NanoMesh Electrode via Self‐assembly of Ultrathin Gold Nanowires

General Synthetic Protocol for the Synthesis of Ru‐X (X=Rh, Pd, Ag) Heterogeneous Ultrathin Nanowires with a Tunable Composition

Contact Info

Product

Resources

About