Discrete electron forces in a nanoparticle-tunnel junction system

Suganuma, Yoshinori; Trudeau, Paul-Emile; Dhirani, Al-Amin; Leathem, B.; Shieh, Ben H. H.

doi:10.1063/1.1571514

Cited by 16 publications

(11 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Among the research reports on electron transfers (ET) between Au MPCs, most have dealt with MPCs in a solvent-wetted state − and fewer with Au MPC ETs in a solvent-dry state − or at temperatures below 200 K. − The present work departs from most previous studies of ETs by using highly monodisperse samples of Au MPCs of, or approaching, molecular size and characterizing their ET kinetics in dry (solvent-free), amorphous films containing set proportions of donors and acceptors. Utilizing the core-charging voltammetry of highly monodisperse small Au MPC solutions, solid-state films containing known states of electronic charging of the MPC cores can be prepared.…”

Section: Introductionmentioning

confidence: 99%

Kinetics and Low Temperature Studies of Electron Transfers in Films of Small (<2 nm) Au Monolayer Protected Clusters

Carducci

Murray

2013

J. Am. Chem. Soc.

View full text Add to dashboard Cite

This work examines the temperature dependence of electron transfer (ET) kinetics in solid-state films of mixed-valent states of monodisperse, small (<2 nm) Au monolayer protected clusters (MPCs). The mixed valent MPC films, coated on interdigitated array electrodes, are Au25(SR)18(0/1-), Au25(SR)18(1+/0), and Au144(SR)60(1+/0), where SR = hexanethiolate for Au144 and phenylethanethiolate for Au25. Near room temperature and for ca. 1:1 mol:mol mixed valencies, the bimolecular ET rate constants (assuming a cubic lattice model) are ~2 × 10(6) M(-1) s(-1) for Au25(SR)18(0/1-), ~3 × 10(5) M(-1) s(-1) for Au25(SR)18(1+/0), and ~1 × 10(8) M(-1) s(-1) for Au144(SR)60(1+/0). Their activation energy ET barriers are 0.38, 0.34, and 0.17 eV, respectively. At lowered temperatures (down to ca. 77 K), the thermally activated (Arrhenius) ET process dissipates revealing a tunneling mechanism in which the ET rates are independent of temperature but, among the different MPCs, fall in the same order of ET rate: Au144(+1/0) > Au25(0/1-) > Au25(1+/0).

show abstract

Section: Introductionmentioning

confidence: 99%

Kinetics and Low Temperature Studies of Electron Transfers in Films of Small (<2 nm) Au Monolayer Protected Clusters

Carducci

Murray

2013

J. Am. Chem. Soc.

View full text Add to dashboard Cite

show abstract

“…Due to the broad implications stemming from the development of nanotechnology, a significant interest is present in the study of single photon and multiphoton fluorescence in systems composed of a combination of metallic nanoparticles (MNPs) and quantum emitters (QEs). − These systems are generally referred to as metallic nanohybrids and nanocomposites. MNPs are generally made of a nanometer-scale piece of metal, most often of a spherical shape, which is surrounded by a coating of a dielectric material.…”

Section: Introductionmentioning

confidence: 99%

Dipole–Dipole Interaction in Two-Photon Spectroscopy of Metallic Nanohybrids

Singh

Persaud

2020

J. Phys. Chem. C

View full text Add to dashboard Cite

We have developed a theory for the two-photon fluorescence in nanohybrids made of an ensemble of metallic nanorod shells and an ensemble of quantum emitters. A metallic nanorod shell is made of a metallic rod and dielectric shell. We consider that the quantum emitters are four-level quantum systems. When a probe laser light falls on the metallic nanorod shells, the surface plasmon polariton electric field is produced at the interface between the metallic nanorod and dielectric shell. This electric field, along with the probe field, induces dipoles in the quantum emitters and nanorod shells. These dipoles interact with each other via the dipole–dipole interaction. The two-photon fluorescence has been calculated by using the quantum density matrix method in the presence of the dipole–dipole interaction (coupling). Analytical expressions of the two-photon fluorescence have been derived in the presence of the dipole–dipole interaction. We showed that that the two-photon process is made of two terms. The first term is the two-photon process due to the two probe field photons. On other the hand, the second term is made of one DDI field photon and one probe field photon. It is found that the surface plasmon polariton resonance energy is not resonant with the exciton energy, the two-photon fluorescence spectrum splits from one peak to three peaks. The splitting in the spectrum is due to the presence of the dressed states created in the system due to the strong dipole–dipole interaction. We also compared our theory with the experimental data of the metallic nanohybrid system made of metallic nanorod shells and quantum emitters (T790 molecules) and found a good agreement between the theory and the experiments.

show abstract

“…Recently, SPPs in MNPs have been widely studied in plasmonic literature. [ 24–31 ] In Section 1, we surveyed the literature for random lasers and nanofiber hybrids. In Section 2, the effect of the SPP and DDI is investigated on the bound photons in plasmonic nanofibers.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Radiative and Nonradiative Emission in Random Lasing Plasmonic Nanofibers

Singh

Brassem

Yastrebov³

2021

Annalen der Physik

View full text Add to dashboard Cite

A theory of light–matter interaction in plasmonic nanofibers is developed. When probe light propagates inside the nanofiber, it induces surface plasmon polariton (SPPs) and electric dipoles in metallic nanoparticles. The dipoles interact with each other via dipole–dipole interaction (DDI). The energy of photonic bound states in the presence of the SPP and DDI fields are calculated. It has been demonstrated that the number of bound states can be controlled by the strength of SPP and DDI couplings. The spontaneous decay rate for the quantum emitters have been calculated and it is found that decay rate is enhanced when the exciton energy is in resonance with the bound photon energy. Further, it is predicted that the spontaneous decay rate also enhances when the exciton and SPP energies are in resonance. Finally, the photoluminescence in nanofiber is calculated using the density matrix method. The authors' theory is compared with experiments and found a good agreement between theory and experiments. It has been demonstrated that the quenching of the photoluminescence intensity increases as the concentration of the MNPs increases. The findings of the paper can be used to fabricate random lasers and also for inventing new types of nanosensors and nanoswitches.

show abstract

Discrete electron forces in a nanoparticle-tunnel junction system

Cited by 16 publications

References 19 publications

Kinetics and Low Temperature Studies of Electron Transfers in Films of Small (<2 nm) Au Monolayer Protected Clusters

Kinetics and Low Temperature Studies of Electron Transfers in Films of Small (<2 nm) Au Monolayer Protected Clusters

Dipole–Dipole Interaction in Two-Photon Spectroscopy of Metallic Nanohybrids

Enhancement of Radiative and Nonradiative Emission in Random Lasing Plasmonic Nanofibers

Contact Info

Product

Resources

About