Batch-Fabricated α-Si Assisted Nanogap Tunneling Junctions

Banerjee, Aishwaryadev; Khan, Shakir-ul Haque; Broadbent, S.; Likhite, Rugved; Looper, Ryan; Kim, Hanseup; Mastrangelo, Carlos H.

doi:10.3390/nano9050727

Cited by 18 publications

(13 citation statements)

References 29 publications

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“…Theoretically, R tunnel is known to increase drastically with the gap distance36 and no tunneling takes place when the gap distance of Au atoms is larger than 0.60 nm 37. Experimentally, the tunneling distance is larger than the theoretical distance because the tunneling current varies with the bias condition and the detailed surface roughness of the contact area 38. There have been several experimental reports about R tunnel .…”

Section: Resultsmentioning

confidence: 99%

2D Percolation Design with Conductive Microparticles for Low‐Strain Detection in a Stretchable Sensor

Hwang

Kim

Park

et al. 2020

Adv Funct Materials

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Although a variety of stretchable strain sensors based on electrical percolation have been reported, stretchable sensors detecting low strains have been rarely demonstrated. This is because large stretchability of a strain sensor conflicts with high strain resolution at low strains. Here, the electrical percolation into 2D is confined and a strain sensor that is highly sensitive at low strains and simultaneously highly stretchable is presented. The 2D confinement of the electrical percolation is accomplished by a close‐packed monolayer assembly of conductive microparticles (MPs) on an elastomer substrate. The current profiles of the MP monolayer at low strains are in situ visualized using conductive atomic force microscopy. When the lattice of the MP monolayer is aligned vertically to the strain direction, the resistance is highly sensitive to low‐strain deformations (ε = 0 – 0.05), but the sensor has reasonable stretchability (ε = 0.3). The simultaneous achievement of the high sensitivity at low strains and the reasonable stretchability is explained by the relationship between the strain‐dependent current profile and the relative position changes of the MPs. A high‐precision pulse sensor clearly showing the representative peaks is demonstrated.

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Section: Resultsmentioning

confidence: 99%

2D Percolation Design with Conductive Microparticles for Low‐Strain Detection in a Stretchable Sensor

Hwang

Kim

Park

et al. 2020

Adv Funct Materials

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“…Garulli et al described a smart temperature-sensor design based on the architecture of CMOS 65 nm technology for use in the IoT network [ 197 ]. Kim et al have recently developed a novel sensing technique for highly sensitive biosensing based on the quantum-tunneling effect using nanogap break-junctions [ 198 , 199 , 200 , 201 , 202 , 203 , 204 , 205 , 206 ]. Furthermore, Mastrangelo et al have also been responsible for developing zero-power and highly sensitive polymeric sensors for VOC detection [ 207 , 208 , 209 , 210 , 211 , 212 , 213 ].…”

Section: Nano-biosensors For Cancer Detection and Future Prospectimentioning

confidence: 99%

Nanostructures for Biosensing, with a Brief Overview on Cancer Detection, IoT, and the Role of Machine Learning in Smart Biosensors

Banerjee

Maity

Mastrangelo

2021

Sensors

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Biosensors are essential tools which have been traditionally used to monitor environmental pollution and detect the presence of toxic elements and biohazardous bacteria or virus in organic matter and biomolecules for clinical diagnostics. In the last couple of decades, the scientific community has witnessed their widespread application in the fields of military, health care, industrial process control, environmental monitoring, food-quality control, and microbiology. Biosensor technology has greatly evolved from in vitro studies based on the biosensing ability of organic beings to the highly sophisticated world of nanofabrication-enabled miniaturized biosensors. The incorporation of nanotechnology in the vast field of biosensing has led to the development of novel sensors and sensing mechanisms, as well as an increase in the sensitivity and performance of the existing biosensors. Additionally, the nanoscale dimension further assists the development of sensors for rapid and simple detection in vivo as well as the ability to probe single biomolecules and obtain critical information for their detection and analysis. However, the major drawbacks of this include, but are not limited to, potential toxicities associated with the unavoidable release of nanoparticles into the environment, miniaturization-induced unreliability, lack of automation, and difficulty of integrating the nanostructured-based biosensors, as well as unreliable transduction signals from these devices. Although the field of biosensors is vast, we intend to explore various nanotechnology-enabled biosensors as part of this review article and provide a brief description of their fundamental working principles and potential applications. The article aims to provide the reader a holistic overview of different nanostructures which have been used for biosensing purposes along with some specific applications in the field of cancer detection and the Internet of things (IoT), as well as a brief overview of machine-learning-based biosensing.

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“…Details of the device fabrication method have been extensively discussed in our previous article 26 . Figure a shows the simplified fabrication process flow.…”

Section: Device Design and Fabricationmentioning

confidence: 99%

Molecular bridge-mediated ultralow-power gas sensing

et al. 2021

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We 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.

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Batch-Fabricated α-Si Assisted Nanogap Tunneling Junctions

Cited by 18 publications

References 29 publications

2D Percolation Design with Conductive Microparticles for Low‐Strain Detection in a Stretchable Sensor

2D Percolation Design with Conductive Microparticles for Low‐Strain Detection in a Stretchable Sensor

Nanostructures for Biosensing, with a Brief Overview on Cancer Detection, IoT, and the Role of Machine Learning in Smart Biosensors

Molecular bridge-mediated ultralow-power gas sensing

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