A Nonenzymatic Biosensor Based on Gold Electrodes Modified with Peptide Self-Assemblies for Detecting Ammonia and Urea Oxidation

Langmuir ◽  
2014 ◽  
Vol 30 (38) ◽  
pp. 11464-11473 ◽  
Author(s):  
Roberta C. Bianchi ◽  
Emerson Rodrigo da Silva ◽  
Luiz H. Dall‘Antonia ◽  
Fabio Furlan Ferreira ◽  
Wendel Andrade Alves
Keyword(s):  
Gold Electrodes ◽  
Nonenzymatic Biosensor

scholarly journals Molecular bridge-mediated ultralow-power gas sensing

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Aishwaryadev Banerjee ◽  
Shakir-Ul Haque Khan ◽  
Samuel Broadbent ◽  
Ashrafuzzaman Bulbul ◽  
Kyeong Heon Kim ◽  
...  
Keyword(s):  
Gas Sensing ◽  
Electron Tunneling ◽  
Gold Surface ◽  
Gold Electrodes ◽  
Self Assembled Monolayer ◽  
Output Resistance ◽  
Resistance Change ◽  
Ultralow Power ◽  
Linker Molecules ◽  
Molecular Bridge

AbstractWe report the electrical detection of captured gases through measurement of the quantum tunneling characteristics of gas-mediated molecular junctions formed across nanogaps. The gas-sensing nanogap device consists of a pair of vertically stacked gold electrodes separated by an insulating 6 nm spacer (~1.5 nm of sputtered α-Si and ~4.5 nm ALD SiO2), which is notched ~10 nm into the stack between the gold electrodes. The exposed gold surface is functionalized with a self-assembled monolayer (SAM) of conjugated thiol linker molecules. When the device is exposed to a target gas (1,5-diaminopentane), the SAM layer electrostatically captures the target gas molecules, forming a molecular bridge across the nanogap. The gas capture lowers the barrier potential for electron tunneling across the notched edge region, from ~5 eV to ~0.9 eV and establishes additional conducting paths for charge transport between the gold electrodes, leading to a substantial decrease in junction resistance. We demonstrated an output resistance change of >108 times upon exposure to 80 ppm diamine target gas as well as ultralow standby power consumption of <15 pW, confirming electron tunneling through molecular bridges for ultralow-power gas sensing.

Amperometric glucose sensor using silicon oxide deposited gold electrodes

1991 ◽  
Vol 3 (6) ◽  
pp. 469-475 ◽  
Author(s):  
Kenji Yokoyama ◽  
Eiichi Tamiya ◽  
Isao Karube
Keyword(s):  
Glucose Sensor ◽  
Silicon Oxide ◽  
Gold Electrodes ◽  
Amperometric Glucose Sensor

Vibronic Effects in Single Molecule Conductance: First-Principles Description and Application to Benzenealkanethiolates between Gold Electrodes

2008 ◽  
Vol 112 (26) ◽  
pp. 9880-9890 ◽  
Author(s):  
C. Benesch ◽  
M. Čížek ◽  
J. Klimeš ◽  
I. Kondov ◽  
M. Thoss ◽  
...  
Keyword(s):  
Single Molecule ◽  
First Principles ◽  
Gold Electrodes ◽  
Vibronic Effects
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