Table of Contents:
00:09 Lecture 3.3: Potentiometric Sensor Charge Screening for Cylindrical Sensors
02:01 Outline
03:10 Recall: Salt screening for Planar Sensor
04:17 Screening different for 1D sensors?
05:10 Cylindrical NW sensor
10:10 Cylindrical NW sensor: at high salt density
11:49 NW sensor: at high salt density
12:53 NW sensor: same result, different constants
15:29 Screening limited response
18:32 Discussion: Salt and screening
19:28 Issue 1: Screening reduces the distance you can see
20:34 Issues 1: You cannot see the full DNA Screening in 2D (NW sensors)
22:53 Issue 2: Distributed vs. localized charge
23:52 Importance of fluidic environment
24:50 Issue 3: Doping is discrete
27:18 Issue 4: Faradic vs. non-Faradic electrodes
29:01 Conclusions
This video is part of the nanoHUB-U course "Principles of Electronic Nanobiosensors". (https://nanohub.org/courses/PEN)
This course provides an in-depth analysis of the origin of the extra-ordinary sensitivity, fundamental limits, and operating principles of modern nanobiosensors. The primary focus is the physics of biomolecule detection in terms of three elementary concepts: response time, sensitivity, and selectivity. And, it potentiometric, amperometric, and cantilever-based mass sensors to illustrate the application of these concepts to specific sensor technologies.
For more details see http://nanohub.org/u
