Skip to main content
U.S. Department of Energy
Office of Scientific and Technical Information

Ultrasensitive Photothermal Spectroscopy: Harnessing the Seebeck Effect for Attogram-Level Detection

Journal Article · · Nano Letters

Molecular-level spectroscopy is crucial for sensing and imaging applications, yet detecting and quantifying minuscule quantities of chemicals remain a challenge, especially when they surface adsorb in low numbers. Here, we introduce a photothermal spectroscopic technique that enables the high selectivity sensing of adsorbates with an attogram detection limit. Our approach utilizes the Seebeck effect in a microfabricated nanoscale thermocouple junction, incorporated into the apex of a microcantilever. We observe minimal thermal mass exhibited by the sensor, which maintains exceptional thermal insulation. The temperature variation driving the thermoelectric junction arises from the nonradiative decay of molecular adsorbates’ vibrational states on the tip. We demonstrate the detection of photothermal spectra of physisorbed trinitrotoluene (TNT) and dimethyl methylphosphonate (DMMP) molecules, as well as representative polymers, with an estimated mass of 10-18 g.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
2001395
Journal Information:
Nano Letters, Journal Name: Nano Letters Journal Issue: 17 Vol. 23; ISSN 1530-6984
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

References (33)

Investigation of the spectral width of quantum cascade laser emission near 5.2 μm by a heterodyne experiment journal September 2001
Polymer-grafted QCM chemical sensor and application to heavy metal ions real time detection journal July 2011
Selective detection of physisorbed hydrocarbons using photothermal cantilever deflection spectroscopy journal February 2014
Chemical Sensors and Molecular Selectivity journal April 1994
Tuning Sensitivity and Selectivity of Complementary Metal Oxide Semiconductor-Based Capacitive Chemical Microsensors journal May 2004
Limits of Recognition for Simple Vapor Mixtures Determined with a Microsensor Array journal April 2004
Photothermal Infrared Spectroscopy of Airborne Samples with Mechanical String Resonators journal October 2013
Femtogram-Scale Photothermal Spectroscopy of Explosive Molecules on Nanostrings journal October 2014
Electronic Nose for Recognition of Volatile Vapor Mixtures Using a Nanopore-Enhanced Opto-Calorimetric Spectroscopy journal July 2015
High-Performance Atomically-Thin Room-Temperature NO 2 Sensor journal July 2020
High-Contrast Plasmonic-Enhanced Shallow Spin Defects in Hexagonal Boron Nitride for Quantum Sensing journal September 2021
Photothermal Electrical Resonance Spectroscopy of Physisorbed Molecules on a Nanowire Resonator journal July 2015
Simultaneous Chemical and Refractive Index Sensing in the 1–2.5 μm Near-Infrared Wavelength Range on Nanoporous Gold Disks journal June 2016
Microscale-Resolution Thermal Mapping Using a Flexible Platform of Patterned Quantum Sensors journal July 2018
Quantum Plasmonic Immunoassay Sensing journal July 2019
Wide-Field Magnetic Field and Temperature Imaging Using Nanoscale Quantum Sensors journal April 2020
Toward Healthcare Diagnoses by Machine-Learning-Enabled Volatile Organic Compound Identification journal December 2020
Micromachined Chip Scale Thermal Sensor for Thermal Imaging journal February 2018
Surface Stress, Kinetics, and Structure of Alkanethiol Self-Assembled Monolayers journal May 2004
Purity Evaluation of As-Prepared Single-Walled Carbon Nanotube Soot by Use of Solution-Phase Near-IR Spectroscopy journal March 2003
Toward Large Arrays of Multiplex Functionalized Carbon Nanotube Sensors for Highly Sensitive and Selective Molecular Detection journal March 2003
Selective Probing and Imaging of Cells with Single Walled Carbon Nanotubes as Near-Infrared Fluorescent Molecules journal February 2008
Dielectrophoresis-Assembled Zeolitic Imidazolate Framework Nanoparticle-Coupled Resonators for Highly Sensitive and Selective Gas Detection journal October 2013
Quantitative Measurement with Scanning Thermal Microscope by Preventing the Distortion Due to the Heat Transfer through the Air journal October 2011
Photothermal spectroscopy with femtojoule sensitivity using a micromechanical device journal November 1994
Biochemical sensing in graphene-enhanced microfiber resonators with individual molecule sensitivity and selectivity journal November 2019
Modified cantilever arrays improve sensitivity and reproducibility of nanomechanical sensing in living cells journal October 2018
Scanning thermal microscopy using batch fabricated thermocouple probes journal June 1998
Scanning thermal microscopy of carbon nanotubes using batch-fabricated probes journal December 2000
Trace explosive detection using photothermal deflection spectroscopy journal May 2008
Effect of chain length on nanomechanics of alkanethiol self-assembly journal September 2007
Photothermal cantilever deflection spectroscopy journal August 2014
Chemical Selectivity and Sensitivity of a 16-Channel Electronic Nose for Trace Vapour Detection journal December 2017

Similar Records

Trace Explosive Detection using Photothermal Deflection Spectroscopy
Journal Article · Mon Dec 31 23:00:00 EST 2007 · Journal of Applied Physics · OSTI ID:966728

Novel micro-calorimetric spectroscopy for mine detection
Conference · Sat Feb 28 23:00:00 EST 1998 · OSTI ID:653986

Microsensors for In-Situ, Real-Time Detection and Characterization of Toxic Organic Substances
Technical Report · Mon May 14 00:00:00 EDT 2001 · OSTI ID:786753