Thermoacoustic transduction in individual suspended carbon nanotubes.

We report an experimental measurement of the acoustic signal emitted from an individual suspended carbon nanotube (CNT) approximate 2 μm in length, 1 nm in diameter, and 10(-21) kg in mass. This system represents the smallest thermoacoustic system studied to date. By applying an AC voltage of 1.4 V at 8 kHz to the suspended CNT, we are able to detect the acoustic signal using a commercial microphone. The acoustic power detected is found to span a range from 0.1 to 2.4 attoWatts or 0.2 to 1 μPa of sound pressure. This corresponds to thermoacoustic efficiencies ranging from 0.007 to 0.6 Pa/W for the seven devices that were measured in this study. Here, the small lateral dimensions of these devices cause large heat losses due to thermal conduction, which result in the relatively small observed thermoacoustic efficiencies.

[1]  C. S. Chen,et al.  Flexible and transparent graphene-based loudspeakers , 2013 .

[2]  Eric Pop,et al.  Negative differential conductance and hot phonons in suspended nanotube molecular wires. , 2005, Physical review letters.

[3]  Brian L. Kline,et al.  Feasibility of a high-powered carbon nanotube thin-film loudspeaker. , 2013, The Journal of the Acoustical Society of America.

[4]  H. D. Arnold,et al.  The Thermophone as a Precision Source of Sound , 1917 .

[5]  S. Cronin,et al.  Anomalous kink behavior in the current-voltage characteristics of suspended carbon nanotubes , 2012, Nano Research.

[6]  S. Cronin,et al.  Large modulations in the intensity of Raman-scattered light from pristine carbon nanotubes. , 2009, Physical review letters.

[7]  S. Cronin,et al.  The effect of gas environment on electrical heating in suspended carbon nanotubes , 2010 .

[8]  Yoichiro Neo,et al.  Study of Carbon-Nanotube Web Thermoacoustic Loud Speakers , 2011 .

[9]  He Tian,et al.  Flexible, ultrathin, and transparent sound-emitting devices using silver nanowires film , 2011 .

[10]  Chester W. Rice,et al.  Notes on the development of a new type of hornless loud speaker , 1925, Journal of the A.I.E.E..

[11]  L. Schadler,et al.  Acoustic emission in single filament carbon/polycarbonate and Kevlar®/olycarbonate composites under tensile deformation , 1990 .

[12]  S. Cronin,et al.  Spatially resolved temperature measurements of electrically heated carbon nanotubes. , 2009, Physical review letters.

[13]  R. Saito,et al.  Evidence for structural phase transitions and large effective band gaps in quasi-metallic ultra-clean suspended carbon nanotubes , 2013, Nano Research.

[14]  Marko Pudas,et al.  Multifunctional free-standing single-walled carbon nanotube films. , 2011, ACS nano.

[15]  Shaoli Fang,et al.  Underwater sound generation using carbon nanotube projectors. , 2010, Nano letters.

[16]  S. Cronin,et al.  Direct observation of mode selective electron-phonon coupling in suspended carbon nanotubes. , 2007, Nano letters.

[17]  Yang Wang,et al.  Flexible, stretchable, transparent carbon nanotube thin film loudspeakers. , 2008, Nano letters.

[18]  R. Ruoff,et al.  Thermoacoustic Sound Generation from Monolayer Graphene for Transparent and Flexible Sound Sources , 2012, Advanced materials.

[19]  T. Ren,et al.  Graphene-on-paper sound source devices. , 2011, ACS nano.

[20]  S. Cronin,et al.  Thermal emission spectra from individual suspended carbon nanotubes. , 2011, ACS nano.

[21]  He Tian,et al.  Single-layer graphene sound-emitting devices: experiments and modeling. , 2012, Nanoscale.

[22]  A. Zettl,et al.  Thermal conductivity of single-walled carbon nanotubes , 1998 .

[23]  M. Meyyappan,et al.  Carbon Nanotube Sensors for Gas and Organic Vapor Detection , 2003 .

[24]  R. Smalley,et al.  Electrical and thermal transport properties of magnetically aligned single wall carbon nanotube films , 2000 .

[25]  A. Zettl,et al.  Electrostatic Graphene Loudspeaker , 2013, 1303.2391.

[26]  J.J. Neumann,et al.  Digital sound reconstruction using arrays of CMOS-MEMS microspeakers , 2002, Technical Digest. MEMS 2002 IEEE International Conference. Fifteenth IEEE International Conference on Micro Electro Mechanical Systems (Cat. No.02CH37266).