HIGH PERFORMANCE PIEZOELECTRIC CRYSTAL ALPHA-BIBO FOR PHOTOACOUSTIC GAS DETECTION
The photoacoustic (PA) effect combing with the piezoelectric effect has been designed for trace gas detection, which has been expected to be operational over a wide temperature range.In this paper, the lead-free piezoelectric crystals LiNbO3 (LN), NdCa4O(BO3)3 (NdCOB) and α-BiB3O6 (BIBO) are studied and compared for potential PA trace gas detection.The piezoelectric voltage coefficients of LN (g21), NdCOB (g12) and BIBO (g21) were characterized and found to be on the order of 0.026 V·m/N, 0.047 V·m/N and 0.225 V·m/N at room temperature, respectively.Among the three kinds of piezoelectric crystals, the BIBO crystal possesses the highest longitudinal piezoelectric coefficient d22 and the largest piezoelectric voltage coefficient g22, being on the order of 40 pC/N and 0.538 V·m/N, respectively.The piezoelectric voltage coefficients for NdCOB and BIBO crystal were obtained to show good temperature stability and maintained the similar values over the temperature range, while the value of g21 for LN crystal showed a decrease with increasing temperature.Taking advantage of the strong piezoelectric activity and high mechanical quality factor Q of BIBO crystal, piezoelectric transducer with central resonance frequency of~443 kHz was fabricated for PA trace gas detection.The final detection limit for trace sulfur hexafluoride (SF6) gas was extended to the parts-per-quadrillion level.
α-BiB3O6 Piezoelectric transducer Photoacoustic effect Trace gas detection
Fei-fei CHEN Fa-peng YU Wen-yu BAI Lian XIONG Gerald J.DIEBOLD Xian ZHAO
State Key Laboratory of Crystal Materials, Shandong University, Jinan, 250100, P.R.China Department of Chemistry, Brown University, Providence, RI 02912, USA
国际会议
哈尔滨
英文
254-257
2019-01-11（万方平台首次上网日期，不代表论文的发表时间）