Tunability of Electronic States in Ultrathin Gold Nanowires

Chandni, U.; Kundu, Paromita; Kundu, Subhajit; Ravishankar, N.; Ghosh, Arindam

doi:10.1002/adma.201204493

Cited by 33 publications

(50 citation statements)

References 30 publications

(49 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The functional form of Eq. 1 has been observed to describe variety of 1D or quasi-1D systems6720212223. Remarkably, the scaling has also been observed beyond 1D systems in conducting polymer films such as poly(2,5-bis(3-tetradecylthiophen-2-yl) thieno[3,2-b]thiophene) (PBTTT)131415 and poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS)1416, and theories such as polaron hopping in semiconducting polymers15, ECB16, and VRH242526 have been developed to explain these findings.…”

mentioning

confidence: 99%

“…Interpretation of experimental results of transport measurements in the context of Eq. 1 is carried out together with a priori knowledge of the system under study671314151620212223242526. Depending on the context, one can assign a meaning to the fitting parameters.…”

mentioning

confidence: 99%

“…For instance, in the case of VRH, γ − 1 is related to L / ξ, where ξ is the localization length and L is the sample length, and α is related to number of hops24. In the context of electron tunneling into LL, γ − 1 is the number of tunneling barriers with the constraints that β = α + 1 and γ −1 = 1 in single tunneling671320212229; for polaron hopping mediated by nuclear tunneling in semiconducting polymers, γ −1 represents the number of hopping events needed for the charge carriers to traverse the distance between electrodes and β = α + 115. These models have all in common α , the exponent of the temperature dependence of conductivity, G ( T ) ∝ T α and β , the exponent of the voltage dependence of current, I ( V ) ∝ V β .…”

mentioning

confidence: 99%

See 2 more Smart Citations

Apparent Power Law Scaling of Variable Range Hopping Conduction in Carbonized Polymer Nanofibers

Kim

Lara‐Avila

et al. 2016

Sci Rep

View full text Add to dashboard Cite

We induce dramatic changes in the structure of conducting polymer nanofibers by carbonization at 800 °C and compare charge transport properties between carbonized and pristine nanofibers. Despite the profound structural differences, both types of systems display power law dependence of current with voltage and temperature, and all measurements can be scaled into a single universal curve. We analyze our experimental data in the framework of variable range hopping and argue that this mechanism can explain transport properties of pristine polymer nanofibers as well.

show abstract

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 1 more Smart Citation

Apparent Power Law Scaling of Variable Range Hopping Conduction in Carbonized Polymer Nanofibers

Kim

Lara‐Avila

et al. 2016

Sci Rep

View full text Add to dashboard Cite

show abstract

“…The TLL is established via clear power-laws, whereas a VRH governed by electron–electron interactions define the localized regime. The linker layer can lead to different effects, such as the electronegative groups lowering the electron density of the nanowires [101]. …”

Section: Recent Development In the Use Of Gold Nanoparticles Basedmentioning

confidence: 99%

New Gold Nanostructures for Sensor Applications: A Review

et al. 2014

View full text Add to dashboard Cite

Gold based structures such as nanoparticles (NPs) and nanowires (NWs) have widely been used as building blocks for sensing devices in chemistry and biochemistry fields because of their unusual optical, electrical and mechanical properties. This article gives a detailed review of the new properties and fabrication methods for gold nanostructures, especially gold nanowires (GNWs), and recent developments for their use in optical and electrochemical sensing tools, such as surface enhanced Raman spectroscopy (SERS).

show abstract

“…A recent example is that of ultrathin (< 2 nm dia) Au nanowires 1 that show significant changes in structure, stability, electron transport, catalytic activity and optical/plasmonic properties compared to bulk Au [2][3][4][5] . An intriguing relaxation mechanism has been observed using transmission electron microscopy (TEM) of ultrathin Au wires [6][7][8] .…”

mentioning

confidence: 99%

Ultrathin Au-alloy nanowires: Synthesis and Stability

Chatterjee

Ravishankar

2017

Microsc Microanal

Self Cite

View full text Add to dashboard Cite

Materials show dramatic changes in properties in the nano regime as compared to bulk. A recent example is that of ultrathin (< 2 nm dia) Au nanowires 1 that show significant changes in structure, stability, electron transport, catalytic activity and optical/plasmonic properties compared to bulk Au 2-5 . An intriguing relaxation mechanism has been observed using transmission electron microscopy (TEM) of ultrathin Au wires [6][7][8] . Fundamental aspects of structure and stability can be probed using ultrathin alloy wires; however there is no existing method to synthesize such wires. We have developed a general and consistent template-assisted growth of robust Au-alloy nanowire (~ 3.5 nm diameter) using ultrathin Au nanowires as templates. The main difficulty associated with the growth of 1-D nanostructures of high-symmetry materials is the symmetry breaking involved in the selection of one orientation over several crystallographically equivalent directions. An oriented attachment mechanism enables the growth of ultrathin Au wires. We use these Au wires as templates to alloy them using wet chemistry. Since the starting Au wires are very fragile and are not stable even at temperatures as low as 80 o C, it is a challenge to convert these into alloy wires involving diffusion at elevated temperatures. In addition, the wires are also unstable in polar media that lead to removal of surfactant. We have developed a method to convert the Au wires into alloy wires at the liquid-liquid interface. The synthesis involves conversion of Au nanowire into AuCu, AuPd and AuPt nanowire by reduction of the second metal precursor on the template Au nanowires. Fig 1 shows the low magnification TEM images and high-resolution images of the alloy nanowire. An array of wire forms on the grid on drop casting of sample solution. The wires are single crystalline with growth direction of [111]. The formation of the alloy phase has been confirmed by x-ray diffraction analysis and UV-visible spectroscopy as presented and analyzed in Fig 2. The overall composition of the wires as evaluated from TEM-EDS analysis is Au-25at%Cu, Au-35at% Pt and Au-35% Pd, respectively. STEM-EDS mapping also confirms presence of both the elements along the length of the wires. The alloy nanowires are significantly more stable as compared to the starting Au nanowires. The alloy wires show higher thermal stability and mechanical stability that was impossible to achieve for Au nanowires. The robustness along with the ultrathin dimension of the wire makes these wires ideal candidate for several applications including catalysis and sensing in addition to shedding fundamental insights into the structure, stability and transport behavior.

show abstract

Tunability of Electronic States in Ultrathin Gold Nanowires

Cited by 33 publications

References 30 publications

Apparent Power Law Scaling of Variable Range Hopping Conduction in Carbonized Polymer Nanofibers

Apparent Power Law Scaling of Variable Range Hopping Conduction in Carbonized Polymer Nanofibers

New Gold Nanostructures for Sensor Applications: A Review

Ultrathin Au-alloy nanowires: Synthesis and Stability

Contact Info

Product

Resources

About