JP6993787B2 - 光触媒活性の評価方法 - Google Patents
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 9
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- 238000004611 spectroscopical analysis Methods 0.000 claims description 9
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- ZMZDMBWJUHKJPS-UHFFFAOYSA-M Thiocyanate anion Chemical compound [S-]C#N ZMZDMBWJUHKJPS-UHFFFAOYSA-M 0.000 claims description 3
- ZMZDMBWJUHKJPS-UHFFFAOYSA-N hydrogen thiocyanate Natural products SC#N ZMZDMBWJUHKJPS-UHFFFAOYSA-N 0.000 claims description 3
- FIKAKWIAUPDISJ-UHFFFAOYSA-L paraquat dichloride Chemical compound [Cl-].[Cl-].C1=C[N+](C)=CC=C1C1=CC=[N+](C)C=C1 FIKAKWIAUPDISJ-UHFFFAOYSA-L 0.000 claims description 3
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- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
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- 229910000428 cobalt oxide Inorganic materials 0.000 description 1
- IVMYJDGYRUAWML-UHFFFAOYSA-N cobalt(ii) oxide Chemical compound [Co]=O IVMYJDGYRUAWML-UHFFFAOYSA-N 0.000 description 1
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- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
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- NALMPLUMOWIVJC-UHFFFAOYSA-N n,n,4-trimethylbenzeneamine oxide Chemical compound CC1=CC=C([N+](C)(C)[O-])C=C1 NALMPLUMOWIVJC-UHFFFAOYSA-N 0.000 description 1
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Description
実施形態に係る光触媒活性の評価方法では、手順1として、ポンプ・プローブ分光法により測定される光触媒の拡散反射スペクトルの時系列データ、つまり、過渡吸収スペクトルを得る。
実施形態に係る光触媒活性の評価方法では、手順2として、手順1で得た拡散反射スペクトルの時系列データを所定のモデルに当てはめて複数のスペクトル成分に分離する。
実施形態に係る光触媒活性の評価方法では、手順3として、手順2で分離した複数のスペクトル成分から、光触媒に発生した励起電子又はホールに由来するものを抽出する。
前記手順1で得た拡散反射スペクトルの時系列データを所定のモデルに当てはめて複数のスペクトル成分に分離する手順2と、
前記手順2で分離した複数のスペクトル成分から、前記光触媒に発生した励起電子又はホールに由来するものを抽出する手順3と、
を有する光触媒活性の評価方法。
サブナノ秒過渡吸収スペクトロメーター(EOS Ultrafast Systems社製)に、ポンプ光源としてのチタンサファイアレーザ(Hurricane-X スペクトラ・フィジックス社製)及び光パラメトリック増幅器(OPA800CF スペクトラ・フィジックス社製)を設けると共に、レンズ部材としての顕微鏡用の対物レンズ(M Plan Apo NIR 20× ミツトヨ社製、開口数0.40、作動距離20.0mm、波長650nmの光に対する焦点距離と波長800nmの光に対する焦点距離との差0.70μm)を、対物側が試料側となるように設けた図1に示すのと同様の構成の拡散反射スペクトル測定装置を準備した。
メーカーの異なる4種の粉末状のルチル型酸化チタンの試料をそれぞれ光触媒のサンプル1~4とした。
<光触媒の分析試験>
光触媒のサンプル1~4のそれぞれについて、以下の分析試験を行った。
サンプル1~4のそれぞれについて、以下の性能試験を行った。
図7A~Dは、サンプル1~4の第2スペクトル成分を示す。また、サンプル1~4のそれぞれの第2スペクトル成分の時定数τ2及び酸素ガス生成速度を表1に示す。
11 試料台
12 ポンプ光源
13 プローブ光源
14 レンズ部材
15 色ガラスフィルタ
16 軸外し放物面鏡
17 分光器
17a 分光器本体
17b 光ファイバケーブル
17c ヘッド部材
18 検出器
19 データ出力部
LE 電線
LO 光導波路
S 試料
Claims (4)
- ポンプ・プローブ分光法により測定される光触媒の拡散反射スペクトルの時系列データを得る手順1と、
前記手順1で得た拡散反射スペクトルの時系列データを所定のモデルに当てはめて複数のスペクトル成分に分離する手順2と、
前記手順2で分離した複数のスペクトル成分から、前記光触媒に発生した励起電子又はホールに由来するものを抽出する手順3と、
を有する光触媒活性の評価方法であって、
前記拡散反射スペクトルの時系列データが、前記光触媒にポンプ光を照射してから1ナノ秒以上1ミリ秒以下の範囲を時分割して測定したデータを含み、
前記モデルは、前記拡散反射スペクトルの時系列データが、各々が相互に独立して指数関数的に減少する前記複数のスペクトル成分の和として表され且つ下記式(1)で一般化されるモデルであり、
c l,λ (t,θ):l成分の装置に関わるパラメータθ及び時間tに依存する関数
ε l (λ):l成分のスペクトル
前記手順3における抽出を、電子捕捉剤又はホール捕捉剤の存在下における前記光触媒について、前記手順1及び2に従って得た複数のスペクトル成分との対比に基づいて行い、
前記手順3では、前記光触媒に発生した励起電子又はホールに由来するスペクトル成分の時定数を前記励起電子又はホールの寿命指標とする光触媒活性の評価方法。 - 前記電子捕捉剤が酸素又はメチルビオローゲンを含む請求項1に記載された光触媒活性の評価方法。
- 前記ホール捕捉剤がメタノール又はチオシアン酸塩を含む請求項1に記載された光触媒活性の評価方法。
- 前記ポンプ・プローブ分光法による測定では、前記光触媒の試料を真空条件下に設ける請求項1乃至3のいずれかに記載された光触媒活性の評価方法。
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JP2008139028A (ja) | 2006-11-29 | 2008-06-19 | Japan Science & Technology Agency | ポンププローブ測定装置及びそれを用いた走査プローブ顕微鏡装置 |
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JP2014175442A (ja) | 2013-03-08 | 2014-09-22 | Dainippon Screen Mfg Co Ltd | 検査装置および検査方法 |
JP2015222192A (ja) | 2014-05-22 | 2015-12-10 | 株式会社ユニソク | 過渡吸収測定方法及び過渡吸収測定装置 |
JP2018179506A (ja) | 2017-04-03 | 2018-11-15 | 花王株式会社 | 拡散反射スペクトル測定装置 |
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JP2008139028A (ja) | 2006-11-29 | 2008-06-19 | Japan Science & Technology Agency | ポンププローブ測定装置及びそれを用いた走査プローブ顕微鏡装置 |
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