scholarly journals Real-time single airborne nanoparticle detection with nanomechanical resonant filter-fiber

2013 ◽  
Vol 3 (1) ◽  
Author(s):  
Silvan Schmid ◽  
Maksymilian Kurek ◽  
Jens Q. Adolphsen ◽  
Anja Boisen
Keyword(s):  
Real Time ◽  
Nanoparticle Detection ◽  
Airborne Nanoparticle

scholarly journals Partially integrated cantilever-based airborne nanoparticle detector for continuous carbon aerosol mass concentration monitoring

2015 ◽  
Vol 4 (1) ◽  
pp. 111-123 ◽  
Author(s):  
H. S. Wasisto ◽  
S. Merzsch ◽  
E. Uhde ◽  
A. Waag ◽  
E. Peiner
Keyword(s):  
Real Time ◽  
Mass Concentration ◽  
Limit Of Detection ◽  
Time Measurement ◽  
Engineered Nanoparticles ◽  
Direct Reading ◽  
Real Time Measurement ◽  
Aerosol Mass Concentration ◽  
Silicon Cantilever ◽  
Airborne Nanoparticle

Abstract. The performance of a low-cost partially integrated cantilever-based airborne nanoparticle (NP) detector (CANTOR-1) is evaluated in terms of its real-time measurement and robustness. The device is used for direct reading of exposure to airborne carbon engineered nanoparticles (ENPs) in indoor workplaces. As the main components, a miniaturized electrostatic aerosol sampler and a piezoresistive resonant silicon cantilever mass sensor are employed to collect the ENPs from the air stream to the cantilever surfaces and to measure their mass concentration, respectively. Moreover, to realize a real-time measurement, a frequency tracking system based on a phase-locked loop (PLL) is built and integrated into the device. Long-term ENP exposure and a wet ultrasonic cleaning method are demonstrated to estimate the limitation and extend the operating lifetime of the developed device, respectively. By means of the device calibrations performed with a standard ENP monitoring instrument of a fast mobility particle sizer (FMPS, TSI 3091), a measurement precision of ENP mass concentrations of < 55% and a limit of detection (LOD) of < 25 μg m−3 are obtained.

scholarly journals Self-reading femtogram microbalance for highly sensitive airborne nanoparticle detection

2019 ◽  
Vol 1319 ◽  
pp. 012004
Author(s):  
M Bertke ◽  
J Xu ◽  
A Setiono ◽  
G Hamdana ◽  
H S Wasisto ◽  
...  
Keyword(s):  
Nanoparticle Detection ◽  
Highly Sensitive ◽  
Airborne Nanoparticle

Real-time monitoring and determination of Pb in a single airborne nanoparticle

2010 ◽  
Vol 25 (7) ◽  
pp. 947 ◽  
Author(s):  
Yoshinari Suzuki ◽  
Hikaru Sato ◽  
Shimpei Hikida ◽  
Kohei Nishiguchi ◽  
Naoki Furuta
Keyword(s):  
Real Time ◽  
Real Time Monitoring ◽  
Airborne Nanoparticle

MEMS-based condensation particle growth chip for optically measuring the airborne nanoparticle concentration

Lab on a Chip ◽  
2019 ◽  
Vol 19 (8) ◽  
pp. 1471-1483 ◽  
Author(s):  
Hong-Beom Kwon ◽  
Seong-Jae Yoo ◽  
Ui-Seon Hong ◽  
Kyungtae Kim ◽  
Jangseop Han ◽  
...  
Keyword(s):  
Real Time ◽  
Low Cost ◽  
Particle Growth ◽  
Nanoparticle Concentration ◽  
Individual Nanoparticles ◽  
Airborne Nanoparticle

We present a low-cost and compact airborne nanoparticle sensor that can count individual nanoparticles in real-time.

scholarly journals Strategy toward Miniaturized, Self-out-Readable Resonant Cantilever and Integrated Electrostatic Microchannel Separator for Highly Sensitive Airborne Nanoparticle Detection

Sensors ◽  
2019 ◽  
Vol 19 (4) ◽  
pp. 901 ◽  
Author(s):  
Maik Bertke ◽  
Jiushuai Xu ◽  
Michael Fahrbach ◽  
Andi Setiono ◽  
Hutomo Wasisto ◽  
...  
Keyword(s):  
Particle Separation ◽  
Signal Amplitude ◽  
Resonance Mode ◽  
Nanoelectromechanical Systems ◽  
Nanoparticle Detection ◽  
Highly Sensitive ◽  
Real Time Tracking ◽  
Monitoring Devices ◽  
Theoretical Sensitivity ◽  
Airborne Nanoparticle

In this paper, a self-out-readable, miniaturized cantilever resonator for highly sensitive airborne nanoparticle (NP) detection is presented. The cantilever, which is operated in the fundamental in-plane resonance mode, is used as a microbalance with femtogram resolution. To maximize sensitivity and read-out signal amplitude of the piezo-resistive Wheatstone half bridge, the geometric parameters of the sensor design are optimized by finite element modelling (FEM). The electrical read-out of the cantilever movement is realized by piezo-resistive struts at the sides of the cantilever resonator that enable real-time tracking using a phase-locked loop (PLL) circuit. Cantilevers with minimum resonator mass of 1.72 ng and resonance frequency of ~440 kHz were fabricated, providing a theoretical sensitivity of 7.8 fg/Hz. In addition, for electrostatic NP collection, the cantilever has a negative-biased electrode located at its free end. Moreover, the counter-electrode surrounding the cantilever and a µ-channel, guiding the particle-laden air flow towards the cantilever, are integrated with the sensor chip. µ-channels and varying sampling voltages will also be used to accomplish particle separation for size-selective NP detection. To sum up, the presented airborne NP sensor is expected to demonstrate significant improvements in the field of handheld, micro-/nanoelectromechanical systems (M/NEMS)-based NP monitoring devices.

scholarly journals Design of Miniaturized, Self-Out-Readable Cantilever Resonator for Highly Sensitive Airborne Nanoparticle Detection

Proceedings ◽  
2018 ◽  
Vol 2 (13) ◽  
pp. 879
Author(s):  
Maik Bertke ◽  
Jiushuai Xu ◽  
Michael Fahrbach ◽  
Andi Setiono ◽  
Gerry Hamdana ◽  
...  
Keyword(s):  
Rest Mass ◽  
Particle Separation ◽  
Optimized Design ◽  
Nanoparticle Detection ◽  
Highly Sensitive ◽  
Measurement Signal ◽  
Monitoring Devices ◽  
Theoretical Sensitivity ◽  
Maximum Measurement ◽  
Airborne Nanoparticle

In this paper, a self-out-readable, miniaturized cantilever resonator for highly sensitiveairborne nanoparticle (NP) detection is presented. The cantilever, which is operated in thefundamental in-plane resonance mode, is used as a microbalance with femtogram resolution. Toachieve a maximum measurement signal of the piezo resistive Wheatstone half-bridge, thegeometric parameters of the sensor design were optimized by finite element modelling (FEM).Struts at the sides of the cantilever resonator act as piezo resistors and enable an electrical read-outof the phase information of the cantilever movement whereby they do not contribute to theresonators rest mass. For the optimized design, a resonator mass of 0.93 ng, a resonance frequencyof ~440 kHz, and thus a theoretical sensitivity of 4.23 fg/Hz can be achieved. A μ-channel guiding aparticle-laden air flow towards the cantilever is integrated into the sensor chip. Electrically chargedNPs will be collected by an electrostatic field between the cantilever and a counter-electrode at theedges of the μ-channel. Such μ-channels will also be used to accomplish particle separation for sizeselectiveNP detection. Throughout, the presented airborne NP sensor is expected to demonstratesignificant improvements in the field of handheld, MEMS-based NP monitoring devices.

scholarly journals Airborne Nanoparticle Detection By Sampling On Filters And Laser-Induced Breakdown Spectroscopy Analysis

2011 ◽  
Vol 304 ◽  
pp. 012012 ◽  
Author(s):  
Pascale Dewalle ◽  
Jean-Baptiste Sirven ◽  
Audrey Roynette ◽  
François Gensdarmes ◽  
Luana Golanski ◽  
...  
Keyword(s):  
Laser Induced Breakdown Spectroscopy ◽  
Spectroscopy Analysis ◽  
Breakdown Spectroscopy ◽  
Nanoparticle Detection ◽  
Laser Induced Breakdown ◽  
Airborne Nanoparticle

Some Recent Results in Quiescent Prominence Spectrometry

1979 ◽  
Vol 44 ◽  
pp. 41-47
Author(s):  
Donald A. Landman
Keyword(s):  
Real Time ◽  
Computer System ◽  
Spectral Response ◽  
Absolute Intensity ◽  
Solar Observatory ◽  
Target Size ◽  
Small Target ◽  
Signal Averaging ◽  
Quiescent Prominence

This paper describes some recent results of our quiescent prominence spectrometry program at the Mees Solar Observatory on Haleakala. The observations were made with the 25 cm coronagraph/coudé spectrograph system using a silicon vidicon detector. This detector consists of 500 contiguous channels covering approximately 6 or 80 Å, depending on the grating used. The instrument is interfaced to the Observatory’s PDP 11/45 computer system, and has the important advantages of wide spectral response, linearity and signal-averaging with real-time display. Its principal drawback is the relatively small target size. For the present work, the aperture was about 3″ × 5″. Absolute intensity calibrations were made by measuring quiet regions near sun center.

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