Rapid, sensitive, and multiplexed on-chip optical sensors for micro-gas chromatography
Karthik Reddy1, Yunbo Guo, Jing Liu
1Department of Biomedical Engineering, University of Michigan, Ann Arbor, MI 48109, USA.
Lab on a Chip
|January 17, 2012
Summary
This study introduces a novel optical vapor sensor array for micro-gas chromatography (μGC). The sensor achieves sub-second detection and sub-picogram limits, significantly advancing vapor analysis technology.
Area of Science:
- Analytical Chemistry
- Materials Science
- Optical Engineering
Background:
- Micro-gas chromatography (μGC) requires highly sensitive and rapid vapor detection.
- Existing on-chip vapor sensors often lack the necessary sensitivity and speed for advanced applications.
Purpose of the Study:
- To develop and characterize an integrated optical vapor sensor array for μGC.
- To achieve rapid, sensitive, and multiplexed detection of vapor analytes.
Main Methods:
- Fabrication of a Fabry-Pérot (FP) interferometer using a micrometre-thin vapor-sensitive polymer on a silicon wafer.
- Creation of a spatially separated sensor array with four different polymers.
- Utilizing a CMOS imager for simultaneous monitoring of polymer responses to vapor analytes.
Main Results:
- Demonstrated sub-second detection times for vapor analytes.
- Achieved a sub-picogram detection limit, a significant improvement over previous on-chip sensors.
- Successfully enabled multiplexed detection of vapor analytes through simultaneous monitoring.
Conclusions:
- The developed optical vapor sensor array is highly effective for μGC applications.
- The sensor offers unprecedented sensitivity and speed for vapor analysis.
- This technology represents a substantial advancement in integrated chemical sensing.
More Related Videos
Related Concept Videos
01:13Gas Chromatography: Overview of Detectors
Detectors in gas chromatography (GC) help identify and quantify the components of a mixture by translating chemical properties into measurable signals, which are displayed on a chromatogram. Detectors can be categorized into two main types: destructive and non-destructive.
A non-destructive detector allows a sample to be analyzed without altering or consuming it, meaning the sample can be collected after detection for further analysis. Examples include thermal conductivity detectors and...
A non-destructive detector allows a sample to be analyzed without altering or consuming it, meaning the sample can be collected after detection for further analysis. Examples include thermal conductivity detectors and...
01:14Gas Chromatography–Mass Spectrometry (GC–MS)
Gas chromatography–mass spectrometry (GC–MS) is the combination of analytical techniques of gas chromatography and mass spectrometry in a single instrument for analyzing a mixture of compounds. The gas chromatograph separates the compounds in the mixture, and the mass spectrometer analyzes each compound separately to determine the molecular masses and molecular structures.
A gas chromatograph consists of a long, narrow capillary column with a polysiloxane coating on the inner wall. The coating...
A gas chromatograph consists of a long, narrow capillary column with a polysiloxane coating on the inner wall. The coating...
01:19Gas Chromatography: Types of Detectors-II
In gas chromatography, different detectors are employed to meet specific analytical needs. These detectors are often categorized based on their detection mechanisms and the types of compounds they are best suited to analyze. Thermal Conductivity Detectors (TCD), Flame Ionization Detectors (FID), and Electron Capture Detectors (ECD) represent common categories, each with unique operating principles and applications. However, beyond these, several other detectors are designed for more specialized...
01:21Gas Chromatography: Types of Detectors-I
There are different types of detectors used in gas chromatography, each with its own specific properties that make it suitable for detecting certain types of analytes. The most commonly used detectors in GC are thermal conductivity detector (TCD), flame ionization detector (FID), and electron capture detector (ECD).
TCD is the earliest and most widely used detector that operates by measuring the changes in the thermal conductivity of the carrier gas. When a sample compound enters the detector,...
TCD is the earliest and most widely used detector that operates by measuring the changes in the thermal conductivity of the carrier gas. When a sample compound enters the detector,...
01:17Microbial Biosensors
Microbial biosensors are analytical devices that utilize living microbes to detect specific substances through measurable signals. These devices consist of two main components: biosensing organisms and signal-transducing elements. Biosensing organisms, such as Escherichia coli or Saccharomyces cerevisiae, are typically housed in multiwell plates connected to transducers, enabling rapid, real-time detection of target analytes.Signal Generation MechanismWhen a target analyte—such as...
01:15High-Performance Liquid Chromatography: Types of Detectors
The role of the detectors in High-Performance Liquid Chromatography (HPLC) is to analyze the solutes as they exit from the chromatographic column. The detector recognizes the solute's property and generates corresponding electrical signals, which are converted into a readable graph of the detector's response versus elution time called a chromatogram at the computer. There are several types of HPLC detectors, each with its own advantages and limitations, depending on the analyte properties and...