Electronic transport, transition-voltage spectroscopy, and the Fano effect in single molecule junctions composed of a biphenyl molecule attached to metallic and semiconducting carbon nanotube electrodes

2014 ◽  
Vol 16 (36) ◽  
pp. 19602-19607 ◽  
Author(s):  
Carlos Alberto Brito da Silva Júnior ◽  
José Fernando Pereira Leal ◽  
Vicente Ferrer Pureza Aleixo ◽  
Felipe A. Pinheiro ◽  
Jordan Del Nero
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Single Molecule ◽  
Electronic Transport ◽  
Fano Effect ◽  
Single Molecule Junctions ◽  
Transition Voltage ◽  
Transport Transition ◽  
Transition Voltage Spectroscopy

We investigate electronic transport in semiconductor–molecule–metal junctions consisting of a biphenyl molecule attached to a p-doped semiconductor and metallic carbon nanotubes.

scholarly journals Scaffolding carbon nanotubes into single-molecule circuitry

2008 ◽  
Vol 23 (5) ◽  
pp. 1197-1201 ◽  
Author(s):  
Brett R. Goldsmith ◽  
John G. Coroneus ◽  
Jorge A. Lamboy ◽  
Gregory A. Weiss ◽  
Philip G. Collins
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Binding Site ◽  
Real Time ◽  
Single Molecule ◽  
Chemical Processes ◽  
Target Species ◽  
Single Walled Carbon Nanotube ◽  
Underlying Mechanisms ◽  
Single Binding Site

While nanowires and nanotubes have been shown to be electrically sensitive to various chemicals, not enough is known about the underlying mechanisms to control or tailor this sensitivity. By limiting the chemically sensitive region of a nanostructure to a single binding site, single molecule precision can be obtained to study the chemoresistive response. We have developed techniques using single-walled- carbon-nanotube (SWCNT) circuits that enable single-site experimentation and illuminate the dynamics of chemical interactions. Discrete changes in the circuit conductance reveal chemical processes happening in real-time and allow SWCNT sidewalls to be deterministically broken, reformed, and conjugated to target species.

Thermoelectricity at the Organic-Inorganic Interface

2010 ◽  
Author(s):  
Shannon Yee ◽  
Jonathan Malen ◽  
Pramod Reddy ◽  
Rachel Segalman ◽  
Arun Majumdar
Keyword(s):  
Single Molecule ◽  
Electronic Transport ◽  
Energy Transport ◽  
Chemical Potential ◽  
Surface States ◽  
Scanning Tunneling ◽  
The Past ◽  
Single Molecule Junctions ◽  
Electronic Conductance ◽  
Inorganic Components

Electronic transport in molecular junctions has been studied through measurements of junction thermopower to evaluate the feasibility of thermoelectric (TE) energy generation using organic-inorganic hybrid materials. Energy transport and conversion in these junctions are heavily influenced by transport interactions at the metal-molecule interface. At this interface the discrete molecular orbitals overlap with continuum electronic states in the inorganic electrodes to create unique energy landscapes that cannot be realized in the organic or inorganic components alone. Over the past decade, scanning probe microscopes have been used to study the electronic conductance of single-molecule junctions[1–5]. Recently, we conducted measurements of junction thermopower using a modified scanning tunneling microscope (STM)[6]. Through our investigations, we have determined: (i) how the addition of molecular substituent groups can be used to predictably tune the TE properties of phenylenedithiol (PDT) junctions[7], (ii) how the length, molecular backbone, and end groups affect junction thermopower[8], and (iii) where electronic transport variations originate[9]. Furthermore, we have recently found that large (10 fold) TE enhancement can be achieved by effectively altering a (noble) metal junction using fullerenes (i.e., C60, PCBM, and C70). We associate the enhancement with the alignment of the frontier orbitals of the fullerene to the chemical potential of the inorganic electrodes. We further found that the thermopower can be predictably tuned by varying the work function of the contacts. This yields considerable promise for altering the surface states at interfaces for enhanced electronic and thermal transport. This paper highlights our work using thermopower as a probe for electronic transport, and reports preliminary results of TE conversion in fullerene-metal junctions.

Single-molecule junctions beyond electronic transport

2013 ◽  
Vol 8 (6) ◽  
pp. 399-410 ◽  
Author(s):  
Sriharsha V. Aradhya ◽  
Latha Venkataraman
Keyword(s):  
Single Molecule ◽  
Electronic Transport ◽  
Single Molecule Junctions

Importance of Direct Metal−π Coupling in Electronic Transport Through Conjugated Single-Molecule Junctions

2012 ◽  
Vol 134 (50) ◽  
pp. 20440-20445 ◽  
Author(s):  
Jeffrey S. Meisner ◽  
Seokhoon Ahn ◽  
Sriharsha V. Aradhya ◽  
Markrete Krikorian ◽  
Radha Parameswaran ◽  
...  
Keyword(s):  
Single Molecule ◽  
Electronic Transport ◽  
Single Molecule Junctions
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