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Related Concept Videos

Microbial Biosensors01:17

Microbial 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...

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Hybrid MoSe2/P3HT Transistor for Real-Time Ammonia Sensing in Biofluids.

Sumit Sharma1,2, Debashree Kar2, Prabal Dweep Khanikar3

  • 1Centre for Applied Research in Electronics, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India.

ACS Applied Materials & Interfaces
|June 6, 2024
PubMed
Summary
This summary is machine-generated.

This study introduces a novel hybrid field-effect transistor (FET) biosensor combining organic and inorganic materials for sensitive ammonia detection in bodily fluids. The device offers a 10-fold improvement over existing methods for point-of-care diagnostics.

Keywords:
biological fluidbiosensorblood plasmafield effect transistororganic/inorganicpoint of caresaliva

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Biomedical Engineering

Background:

  • 2D transition metal dichalcogenides (TMDs) like MoSe2 show promise for biosensing but suffer from nonspecific interactions.
  • Organic semiconductors such as P3HT offer complementary properties for enhanced device performance.
  • Ammonia levels in biological fluids are critical indicators of physiological and pathological states.

Purpose of the Study:

  • To develop a hybrid field-effect transistor (FET) biosensor integrating organic (P3HT) and inorganic (MoSe2) components.
  • To achieve accurate and selective detection of ammonia in human bodily fluids, overcoming limitations of existing TMD-based sensors.
  • To establish a sensitive, stable, and repeatable platform for real-time ammonia monitoring for potential point-of-care diagnostics.

Main Methods:

  • Fabrication of a hybrid FET device utilizing layered molybdenum diselenide (MoSe2) and poly(3-hexylthiophene) (P3HT).
  • Testing the hybrid FET biosensor's sensitivity, selectivity, and stability for ammonia detection in artificial saliva, saliva, and plasma.
  • Characterization of the device's performance across a range of ammonia concentrations (0.5 μM to 1 mM).

Main Results:

  • The hybrid FET biosensor demonstrated high sensitivity for total ammonia (NH4+ and NH3) with a detection limit of 0.65 μM.
  • The sensor exhibited excellent specificity in artificial saliva against potential interfering species.
  • The device achieved a remarkable response level of 2300 at 1 mM ammonia concentration, significantly outperforming existing literature.

Conclusions:

  • The developed hybrid FET biosensing platform effectively combines organic and inorganic semiconductor advantages for superior bioanalyte detection.
  • This technology holds significant promise for precise, real-time monitoring of ammonia in human biological fluids.
  • The platform offers potential applications in developing advanced point-of-care diagnostic tools.