Inhomogeneous Transport Regime in Disordered Materials

Cohen, Morrel H.; Jortner, Joshua

doi:10.1103/physrevlett.30.699

Cited by 178 publications

(26 citation statements)

References 36 publications

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“…Many experimental investigations have been made focusing on the M-NM transition in fluid Hg [1,2,[4][5][6][7][8] and much theoretical effort devoted to explaining them [9][10][11][12][13][14]. Measurements of the electrical conductivity, thermopower, Hall coefficient, optical reflectivity, optical absorption coefficient and nuclear magnetic resonance clearly indicate that the M-NM transition occurs at around 9 g/cm 3 .…”

Section: Introductionmentioning

confidence: 99%

Structural variation of expanded fluid mercury during M–NM transition: A Reverse Monte Carlo study

Hong

2007

Journal of Non-Crystalline Solids

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Section: Introductionmentioning

confidence: 99%

Structural variation of expanded fluid mercury during M–NM transition: A Reverse Monte Carlo study

Hong

2007

Journal of Non-Crystalline Solids

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“…A short-range order determined collapse of the pseudogap occurs upon further heating. The density of states at the Fermi level increases gradually [1,2]. Such an increase leads to delocalization of electrons, and the pseudogap narrows according to the following formula [1]:…”

Section: Introductionmentioning

confidence: 99%

Reverse metal–non-metal transition in semiconducting melts

Sklyarchuk¹,

Plevachuk²

2004

Journal of Non-Crystalline Solids

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“…The granular metal conductivity model [21][22][23][24][25] has been studied extensively for systems such as 2-2000Å metal (Au, Ag, Ni) grains dispersed below the percolation threshold in a dielectric medium, such as SiO 2 particles of the same size. The theory can be categorized into socalled low-field and high-field conductivity regimes.…”

Section: Theorymentioning

confidence: 99%

Nanoelectronic Chemical Sensors for Chemical Agent and Explosives Detection

Smardzewski

Jarvis

Snow

et al. 2006

Transformational Science and Technology for the Current and Future Force

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A new class of nanometer-scale, low power, solidstate devices is being investigated for the detection of CW agents and other hazardous vapors. These nanoelectronic chemical vapor sensors, or "chemiresistors" are comprised of nanometer-sized gold particles (1.2-2.4nm) encapsulated by monomolecular layers of functionalized alkanethiols (R-SH) deposited as thin films on interdigitated microelectrodes (Fig 1). When chemical (agent, explosive) vapors reversibly absorb into these thin films, a large modulation of the electrical conductivity of the film is observed. The measured current between gold clusters is extremely sensitive to very small amounts of monolayer swelling or dielectric alteration caused by absorption of vapor molecules. For chemical agent simulants, a large dynamic range (5-logs) of sensitivities is observed and extends down to ppb (parts-per-billion) vapor concentrations. For explosive vapors of TNT/DNT detection limits in the femtogram range have been observed. Complete reversibility has been observed for all analyte vapors and the devices exhibit relatively low sensitivity to water vapor (a major interferent). Tailored selectivities of the sensors are accomplished by incorporation of chemical functionalities at the terminal structure of the alkanethiol or substitution of the entire alkane structure. BACKGROUNDOver the past ten years, there has been considerable interest in nanometer-sized materials largely due to the wide range of applications of these materials in several fields including advanced electronics, nonlinear optics, catalysis and hydrogen adsorption 2 where a new method was developed for preparing and stabilizing nanometer-sized gold colloids that are easily dispersed in organic solvents and isolated as pure powders. Colloids have been studied since Faraday's examination of them 3 but they were only stable in solution. Depending on the preparative conditions, the particles had a tendency to agglomerate slowly, eventually lose their disperse character and flocculate. The removal of solvent generally led to the complete loss of the ability to reform a colloidal solution. Brust and coworkers solved this problem by "protecting" the gold colloids or clusters with the self-assembled surfactant, dodecanethiol (C 12 H 25 SH), which was then well known to form self-assembled monolayers on planar gold surfaces 4 . Leff and coworkers 5 further demonstrated that control of the gold particle size in this system could be achieved by varying the gold-tothiol reactant ratio and applied a model in which the role of the thiol is analogous to that of the surfactant in water-in-oil microemulsions. In many respects these new cluster compounds behave like simple chemical compounds; they can be precipitated, redissolved and chromatographed 6 without any apparent change in properties. This preparative methodology allowed a reasonable degree of control of the size of the nanoparticles, and most research groups have targeted the technologically-attractive 1-5 nm size range for these monolayer-protected...

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Inhomogeneous Transport Regime in Disordered Materials

Cited by 178 publications

References 36 publications

Structural variation of expanded fluid mercury during M–NM transition: A Reverse Monte Carlo study

Structural variation of expanded fluid mercury during M–NM transition: A Reverse Monte Carlo study

Reverse metal–non-metal transition in semiconducting melts

Nanoelectronic Chemical Sensors for Chemical Agent and Explosives Detection

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